delivered the opinion of the Court.

These cases raise the same question, namely, whether transfers of property inter vivos made in trust, the particulars of which will later appear, are within the provisions of § 302 (c) of the Revenue Act of 1926.1 They *110were heard in succession and may be decided together. In each case the Commissioner of Internal Revenue' included the trust property in the decedent’s gross estate. In Nos. 110, 111 and 112 his determination was reversed by the Board of Tax Appeals, 34 B. T. A. 575, and the Board was affirmed by the Circuit Court of Appeals for the Sixth Circuit, 102 F. 2d 1. In No. 183, the taxpayer paid under protest, successfully sued for recovery in the District Court for the Eastern District of Pennsylvania, and his judgment was sustained by the Circuit Court of Appeals for the Third Circuit, 103 F. 2d 834. In No. 399, the Commissioner was in part successful before the Board of Tax Appeals, 36 B. T. A. 669, and the Circuit Court of Appeals for the Second Circuit affirmed the Board, 104 F. 2d 1011.

Neither here nor below does the issue turn on the un-glossed text of § 302 (c). In its enforcement, Treasury and courts alike encounter three recent decisions of this Court, Klein v. United States, 283 U. S. 231, Helvering v. St. Louis Trust Co., 296 U. S. 39, and Becker v. St. Louis Trust Co., Ibid. 48. Because of the difficulties which lower courts have found in applying the distinctions made by these cases and the seeming disharmony .of their results, when judged-by the controlling .purposes of the estate tax law, we brought the cases here. All involve dispositions of property by way of trust in which the settlement provides for return or reversion of the corpus J;o the donor upon a contingency terminable at his death? Whether the transfer made by the decedent in his lifetime is “intended to take effect in possession or enjoyment at or after his death” by reason of that which he retained, is the crux of the problem. We must put to one side questions that arise under sections of the estate tax law other than § 302 (c) — sections, that is, relating to transfers taking place at death. Section 302 (c) deals with *111property not technically passing at death but with interests theretofore created. The taxable event is a transfer inter vivos. But the measure of the tax is the value of the transferred property at the time when death brings it into enjoyment.

We turn to the cases which beget the difficulties. In Klein v. United States, supra, decided in 1931, the decedent during his lifetime had conveyed land to his wife for her lifetime, “and if she shall die prior to the decease of said grantor then and in that event she shall by virtue hereof take no greater or other estate in said lands and the reversion in fee in and to the same shall in that event remain vested in said grantor, . . .” The instrument further provided, “Upon condition and in the event that said grantee shall survive the said grantor, then and in that case only the said grantee shall by virtue of this conveyance take, have, and hold the said lands in fee simple, . . .” The taxpayer contended that the decedent had reserved a mere “possibility of reverter” and that such a “remote interest,”2 extinguishable upon the grantor’s death, was not sufficient to bring the conveyance within the reckoning of the taxable estate. This Court held otherwise. It rejected formal distinctions pertaining to the law of real property as irrelevant criteria in this field of taxation. “Nothing is to be gained,” it was said, “by multiplying words in respect of the various niceties of the art of conveyancing or the law of contingent and vested remainders. It is perfectly plain that ‘'the death of the grantor was the indispensable and intended event which brought the larger estate into being for the grantee and effected its transmission from the dead to the living, thus satisfying the terms of the taxing act and justifying the tax imposed.” Klein v. United States, supra, at 234.

*112The inescapable rationale of this decision, rendered by a unanimous Court, was that the statute taxes, not merely those interests which are deemed to pass at death according to refined technicalities of the law of property. It also taxes inter vivos transfers that are too much akin to testamentary dispositions not to be subjected to the same excise. By bringing into the gross estate at his death that which the. settlor gave contingently upon it, this Court fastened on the vital factor. It refused to subordinate the plain purposes of a modern fiscal measure to^the wholly unrelated origins of the recondite learning of ancient property law. Surely the Klein decision was not intended to encourage the belief that a change merely in the phrasing of a grant would serve to create a judicially cognizable difference in the scope of § 302 (c), although the grantor retained in himself the possibility of regaining the transferred property upon precisely the same contingency. The teaching of the Klein case is exactly the opposite.3

In 1935 the St. Louis Trust cases came here. A rational application of the principles of the Klein case to the situations now before us calls for scrutiny of the particulars in the St. Louis cases in order to extract their relation to the doctrine of the earlier decision.

In Helvering v. St. Louis Trust Co., supra, the decedent had conveyed property in trust, the income of which was to be paid to his daughter during her life, but at her death “If the grantor still be living, the Trustee shall forthwith . . . transfer, pay, and deliver the entire estate to the grantor, to be his absolutely.” But “If the grantor be then not living” then the income, was to be *113devoted to the settlor s wife if she were living, and upon the death of both daughter and wife, if he were not living, the trust property was to go to the daughter’s children, or if she left none, to the grantor’s next of kin.

In Becker v. St. Loyds Trust Co., supra, the decedent had declared himself trustee of property with the income to be accumulated or, at his discretion, to be paid over to his daughter during her life. The instrument fur-' ther provided that “If the said beneficiary should die before my death, then this trust estate shall thereupon revert to me and become mine immediately and absolutely, or ... if I should die before her death, then this property shall thereupon become hers immediately and absolutely . .

On the authority of the Klein case the Commissioner had included in the taxable estates the gifts to which, in the St. Louis Trust cases, the grantor’s death had given definitive measure. If the wife- had predeceased the set-tlor in the Klein case, he would have been repossessed of his property. His wife’s interests were freed from this contingency by the husband’s prior death, and because of the effect of his death this Court swept the gift into the gross estate. So in Helvering v. St. Louis Trust Co., the grantor would have become repossessed of the granted corpus had his daughter predeceased him. But he predeceased her and by that event her interest ripened to full dominion. The same analysis applies to the Becker case. In all three situations the result and effect were the same. The event which gave to the beneficiaries a dominion over property which they did not have prior to the donor’s death was an act of nature outside the grantor’s “control, design or volition.” 296 U. S. 39, 43. But it was no more and no less “fortuitous,” so. far as the grantor’s “control, design or volition” was concerned, in the St. *114Louis Trust cases than it was in the Klein case. In none of the three cases did the dominion over property which finally came to the beneficiary fall by virtue of the grantor’s will, except by his provision that his own death should establish such final and complete dominion. And yet a mere difference in phrasing- the circumstance by which identic interests in property were brought into being — varying forms of words in the creation of the same worldly interests — was found sufficient to exclude the St. Louis Trust settlements from the application of the Klein doctrine.

Four members of the Court saw no difference. They relied on the governing principle of § 302 (c) that Congress meant to include in the gross estate inter vivos gifts “which may be resorted to, as a substitute for a will, in making dispositions of property operative at death.” 296 U. S. at 46. To effectuate this purpose practical considerations applicable to taxation and not the “niceties of the art of conveyancing” were their touchstone. “Having in mind,” said the dissenters, “the purpose of the statute and the breadth of its language it would seem to be of no consequence what particular conveyancers’ device — what particular string — the decedent selected to hold in suspense the ultimate disposition of his property until the .moment of his death. In determining whether a taxable transfer becomes complete, only at death we look to substance, not to form . . . However we label the device it is . but a means by which the gift, is rendered incomplete until the donor’s death.” 296 U. S. at 47. For the majority in the St. Louis Trust Company cases, these practicalities had less significance than the formal categories of property law. The grantor’s death, the majority said, in Helvering v. St. Louis Trust Co., “simply put an end to what, at best, wás a mere possibility óf a reverter by extinguishing it — that is to say, by converting what was merely possible into an utter impossibility.” 296 U. S. *11539, 43. This was precisely the mode of argument which had been rejected in Klein v. United States, supra.

We are now asked to accept all three decisions as constituting a .coherent body of law, and to apply their distinctions to the trusts before us.

In Nos. 110, 111 and 112 (Helvering v. Hallock) the decedent in 1919 created a trust under a separation agreement, giving 'the income to his wife for life, with this further provision:

“If and when Anne Lamson Hallock shall die then and in such event . . . the within trust shall terminate and said Trustee shall . . . pay Party of the First Part if he then be living any accrued income then remaining in said trust fund and shall . . . deliver forthwith to Party of the First Part, the principal of the said trust fund. If and in the event said Party of the First Part shall not be living then and in such event payment and delivery over shall be made to Levitt Hallock and Helen Hallock, respectively son and daughter of the. Party of the First Part share and share alike . . .”

When the settlor died in 1932, his divorced wife, the life beneficiary, survived him. The Circuit Court of Appeals held that the trust instrument had conveyed the “whole interest” of the decedent, subject only to a “condition subsequent,” which left him nothing “except a mere possibility of reverter.” Commissioner v. Hallock, 102 F. 2d 1, 3-4.

In No. 183 (Rothensies v. Huston) the decedent by an ante-nuptial agreement in 1925 conveyed property in trust, the income to be paid to his prospective wife during her life, subject to the following disposition of the principal:

“In trust if the said Rae Spektor shall die during the lifetime of said George F. Uber to pay over the principal and all accumulated income thereof unto the said George F. Uber in fee, free and clear of any trust.

*116“In trust if the said Rae Spektor after the marriage shall survive the said George F. Uber to pay over the principal and all accumulated income unto the said Rae Spektor — then Rae Uber — in fee, free and clear of any trust.”

Mrs. Uber outlived her husband, who died in 1934. The Circuit Court of Appeals deemed Becker v. St. Louis Trust Co. controlling against the inclusion of the trust corpus in the gross estate.

Finally, in No. 399 (Bryant v. Helvering), the testator provided for the payment of trust income to his wife during her life and upon her death to the settlor himself if he should survive her. The instrument, which was executed in 1917, continued:

“Upon the death of the survivor of said Ida Bryant and the party of the first, part, unless this trust shall have been modified or revoked as hereinafter provided, to convey, transfer, and pay over the principal of the trust fund to the executors or administrators of the estate of the party hereto of the first part.”

There was a further provision giving to the decedent and his wife jointly during their lives, and to either of them after the death of the other, power to modify, alter or revoke the instrument. Th'e wife survived the husband, who died in 1930. The Board of Tax Appeals allowed the Commissioner to include in the decedent’s gross estate only the value of a “vested reversionary interest” which the Board’held tbe grantor had reserved to himself. On appeal by the tax-payér, the Circuit Court of Appeals sustained this determination.

The terms of these grants differ in detail from one another, as all three differ from the formulas of conveyance used in the Klein and St. Louis Trust cases. It therefore becomes important to inquire whether the technical forms in which interests contingent upon death *117are cast should control our decision. If so, it becomes necessary to determine whether the differing terms of conveyance now in issue approximate more closely those used in the Klein case and are therefore governed by it, or have a greater verbal resemblance to those that saved the tax in the St. Louis Trust cases. Such an essay in linguistic refinement would still further embarrass existing intricacies. It might demonstrate verbal ingenuity, but it could hardly strengthen the rational foundations of law. The law of contingent and vested remainders is full of casuistries. There are great diversities among the several states as to the conveyancing significance of like grants; sometimes in the same state there are conflicting lines of decision, one series ignoring the other. Attempts by the Board of Tax Appeals and the Circuit Courts of Appeal to administer § 302 (c) by reference to these distinctions abundantly illustrate the inevitable confusion.4 One of the cases at bar, No. 399, reveals vividly the snares which inevitably await an attempt to base estate tax law on the “niceties of the art of conveyancing.” In connection with the ascertainment of its own death duties, the Supreme Court of Errors of Connecticut defined the nature of the interest which the decedent in that case retained after his inter vivos transfer. Bryant v. Hackett, 118 Conn. 233; 171 A. 664. And yet the nature of that interest under Connecticut law and the scope of the Connecticut court’s adjudication of that interest were made the subject' of lively controversy be*118fore us. The importation of these distinctions and controversies from the law of property into the administration of the estate tax precludes a fair and workable tax system. Essentially the same interests, judged from the point of view of wealth, will be taxable or not, depending upon elusive and subtle casuistries which may have their historic justification but possess no relevance for tax purposes.5 These unwitty diversities of the law of property derive from medieval concepts as to the necessity of a continuous seisin.6 Distinctions which originated under a feudal economy when land dominated social relations are peculiarly irrelevant in the application of tax measures now so largely directed toward intangible wealth.

Our real problem, therefore, is to determine whether we are to adhere to a harmonizing principle in the construction of § 302 (c), or whether we are to multiply gossamer distinctions between the present cases and the three earlier ones. Freed from the distinctions, introduced by the St. Louis Trust cases, the Klein case furnishes such a harmonizing principle. Does, then, the doctrine of stare decisis compel us to accept the distinc*119tions made in the St. Louis Trust cases as starting points for still finer distinctions spun out of the tenuosities of surviving feudal law? We think not. We think the Klein case rejected the presupposition of such distinctions for the fiscal judgments which § 302 (c) demands.

We recognize that stare deciJs embodies an important social policy. It represents an element of continuity in law, and is rooted in the psychologic need to satisfy reasonable expectations. But stare decisis is a principle of policy and not a mechanical formula of adherence to the latest decision, however recent and questionable, when such adherence involves collision with a prior doctrine more embracing in its scope, intrinsically sounder, and verified by experience.

Nor have we in the St. Louis Trust cases rules of decision around which, by the accretion of time and the response of affairs, substantial interests have established themselves. No such conjunction of circumstances requires perpetuation of what we must regard as the deviations of the St. Louis Trust decisions from the Klein doctrine. We have not before us interests created or maintained in reliance on those cases. We do not mean to imply that the inevitably empiric process of construing tax legislation should give rise to an estoppel against the responsible exercise of the judicial process. But it is a fact that in all the cases before us the settlements were made and the settlors died before the St. Louis Trust decisions.

Nor does want of specific Congressional repudiations of the St. Louis Trust cases serve as an implied instruction by Congress to us not to reconsider, in the light of new experience, whether those decisions, in conjunction with the Klein case, make for dissonance of doctrine. It would require very persuasive circumstances enveloping Congressional silence to debar this Court from reexamining its own doctrines. To explain the cause of *120non-action by Congress when Congress itself sheds no light is to venture into speculative unrealities.7 Congress may not have had its attention directed to an undesirable decision; and there is no indication that as to the St. Louis Trust cases it had, even by any bill that found its way into a committee pigeon-hole. Congress may not have had its attention so directed for any number of reasons that may have moved the Treasury to stay its hand. But certainly such inaction by the Treasury can hardly operate as a controlling administrative practice, through *121acquiescence, tantamount to an estoppel barring reexamination by this Court of distinctions which it had drawn.8 Various considerations of parliamentary tactics and strategy might be suggested as reasons for the inaction of the Treasury and of Congress, but they would only be sufficient to indicate that we walk on quicksand when we try to find in the absence of corrective legislation a controlling legal principle.

This Court, unlike the House of Lords,9 has from the beginning rejected a doctrine of disability at self-correction. Whatever else may be said about want of Congressional action to modify by legislation the result in the St. Louis Trust cases, it will hardly be urged that the rea*122son was Congressional approval of those distinctions between the St. Louis Trust and the Klein cases to which four members of this Court could not give assent. By imputing to Congress a hypothetical recognition of coherence between the Klein and the St. Louis Trust cases, we cannot evade our own responsibility for reconsidering in the light of further experience, the validity of distinctions which this Court has itself created. Our problem then is not that of rejecting a settled statutory construction. The real problem is whether a principle shall prevail over its later misapplications. Surely we are not bound by reason or by the considerations that underlie stare decisis to persevere in distinctions taken in the application of a statute which, on further examination, appear consonant neither with the purposes of the statute nor with this Court’s own conception of it. We therefore reject as untenable the diversities taken in the St. Louis Trust cases in applying the Klein doctrine — untenable because they drastically eat into the principle which those cases professed to accept and to which we adhere.

In Nos. 110, 111, 112 and 183, the judgments are

Reversed.

In No. 399, the judgment is

Affirmed.,

dissenting.

There is certainly a distinction in fact between the transaction considered in Klein v. United States, 283 U. S. 231, and those under review in Helvering v. St. Louis Union Trust Co., 296 U. S. 39, and Becker v. St. Louis Uniont Trust Co., 296 U. S. 48. The courts, the Board of Tax Appeals, and the Treasury have found no difficulty in observing the distinction in specific cases. I believe it is one of substance, not merely of terminology, and not dependent on the niceties of conveyancing or recondite doctrines of ancient property law.

But if I am wrong in this, I still think the judgments in Nos. 110-112, and 183 should be affirmed and that in 399 should be reversed. The rule of interpretation adopted in the St. Louis Union Trust Company cases should now be followed for two reasons: First, that rule was indicated by decisions of this court as the one applicable in the circumstances here disclosed, as early as 1927; was progressively developed and applied by the Board of Tax Appeals, the lower federal courts, and this court, up to the decision of McCormick v. Burnet, 283 U. S. 784, in 1931; and has since been followed by those tribunals in not less than fifty cases. It ought not to be set aside after such a history. Secondly. The rule was not contrary to any treasury regulation; was, indeed, in accord with such regulations as there were on the subject; .was subsequently embodied in a specific regulation, and, with this background, Congress has three times reenacted the law without amending § 302 (c) in respect of the matter here in issue. The settled doctrine, that reenactment of a statute so construed, without alteration, renders such construction a part of the statute itself, should not be ignored but observed.

*1241. The Revenue Act of 1926 lays a tax upon the transfer of the net estate of a decedent. That estate is defined to embrace the value of all his property, real or personal, tangible or intangible (less certain deductions), at the time of his death.1 As the Treasury Department stated in its earliest regulations: “The statute also includes only property rights existing in the decedent in his lifetime and .passing to his estate.”2 In all the treasury regulations, from the earliest to the one now in force, applicable to the relevant sections of the successive Revenue Acts defining the “gross estate” of a decedent the Treasury has used this language:3

“The value of a vested remainder should be included in the gross estate. Nothing should be included, however, on account of a contingent remainder where [in the case] the contingency does not happen in the lifetime of the decedent, and the interest consequently lapses at his death.” [Italics supplied.].

The next sentence: “Nor should anything be included on account of a life estate in the decedent,” has been repeated in substance in the corresponding article of all subsequent regulations.

If by the will of his grandmother, A is given a life estate, with remainder to another, his executor is not bound to return anything on Account of the life estate because, in respect .of it, nothing passes on A’s death. The estate simply ceases. The Treasury has never contended the contrary. If, however, A’s grandmother gave a life estate to B, and the remainder to A, A has something which, at his death, will pass to someone else under his will, or Under the intestate laws. The statute plainly taxes' the valué of the interest thus transferred at A’s death.

*125If A’s grandmother, by her will, gave interests in succession to specific persons and then provided that if A should outlive all these persons the property should pass to him, A would have a chance to receive and enjoy the property. If he did so. receive it, it would pass as part of his estate. If he died before the other beneficiaries named by his grandmother his death would deprive him of that chance. The chance would not pass to anyone else. No tax would be laid on the supposed value of his contingent interest or chance, because the chance cannot, at his death, pass by his will, or the intestate laws, to another. I do not understand the Government has ever denied this.

Subséction (e) of § 302 lays down no different rule respecting similar interests created by irrevocable deed or agreement of the decedent. The subsection directs that there shall be included in the gross estate the value, at' the time of the decedent’s death, of any interest in property of which the decedent has at any time made a transfer “intended to take effect in possession or enjoyment at or after his death” (excluding sales for adequate consideration).

A transfer can only take effect, within the meaning of the statute, by the shifting of possession or enjoyment from the decedent to living persons.. The fact that the terms of the gift bring about some other effect at the decedent’s death is immaterial. The fact that something may happen in respect of the beneficial enjoyment of the propérty conditioned upon the decedent’s death is irrelevant so long as that something is not the shifting of possession or beneficial enjoyment from the decedent. This is made clear by Reinecke v. Northern Trust Co., 278 U. S. 339, 347.

If A makes a present irrevocable transfer in trust, conditioned that he shall receive the income for life and, at his death, the principal shall go to B, B is at once legally *126invested with the principal. A’s life .estate ceases at his death. Nothing then passes. There is no tax imposed by the statute because there is no transfer any more than there would be in the case of a similar life estate given A by his grandmother. (This is May v. Heiner, 281 U. S. 238.) If, on the other hand, A creates an estate for years or for life in B, retaining the remaining beneficial interest .in the property for himself, and, whether by the terms of the grant, or by the terms of A’s will, or under the intestate law, that remainder passes to someone else at his death, such passage renders the transfer taxable. (This is Klein v. United States, supra.) If what A does is to transfer his property irrevocably, with provision that it shall be. enjoyed successively by various persons for life and then go absolutely to a named person, but that if he, A, shall outlive that person, the property shall come back to him, and A dies in the lifetime of the person in question, A has merely" lost the chance that the beneficial ownership of the property may revert to him. That chance cannot pass under his will or under the intestate laws. As there is no transfer which can become effective at his death by the shifting of any interest from him, no tax is imposed, (This is McCormick v. Burnet, supra, and Helvering v. St. Louis Union Trust Company, supra.)

2. These governing principles were indicated as early as 19274 and were thereafter developed, in application to specific cases, in a consistent line of authorities.

In May v. Heiner, supra, it was held that a transfer in trust under which the income was payable to. the trans-feror’s husband for his life and, after his death, to the transferor during her life, with remainder to her children, was not subject to tax as a'transfer intended to; take effect *127in possession or enjoyment at or after death. . This court said (p. 243):

“. . . At the death of Mrs. May no interest in the property held under the trust deed, passed from her to the living; title thereto had been definitely fixed by the trust deed. The interest therein which she possessed .immediately prior to her death was obliterated by that event.” [Italics supplied.]

It will be noted that this is the equivalent of the Treasury’s statement, supra, that such an interest lapses at death'.

That decision is indistinguishable in principle from the St. Louis Union Trust Company cases and the instant cases; and what was there said serves to distinguish the Klein case.

McCormick v. Burnet followed May v. Heiner. The court there held that neither a reservation by the grantor of a life estate with remainders over, nor a provision for a reverter in case all the beneficiaries should die in the lifetime of the grantor, made the gifts transfers intended to take effect in possession or enjoyment at or after the grantor’s death. In the Circuit Court of Appeals the Commissioner urged that the provision for payment of the trust estate to the settlor in case she survived all the beneficiaries rendered the transfer taxable. That court dealt at length with the point and sustained his view. (43 F. 2d 277, 279.) The Commissioner made the same contention in this court, but it was overruled upon the authority of May v. Heiner.

Then came the two St. Louis Union Trust Company cases, decided upon the authority of May v. Heiner and McCormick v. Burnet. Finally, the McCormick case wad followed in Bingham v. United States, 296 U. S. 211.

Since the opinion of the- court appears to treat the St. Louis cases as the origin of the principle there announced, *128it is important to emphasize the fact that the rule had been settled by this court as early as 1930; and to note, other decisions rendered prior to the St. Louis cases. In seven, intervening between May v. Heiner and the St. Louis cases, the Board 'of Tax Appeals reached the same conclusion as that announced in the St. Louis cases.5 The Board’s action was affirmed in four of them.6 Four other decisions by Circuit Courts of Appeals were to the same effect.7 In practically all, reliance was placed upon Shukert v. Allen, Reinecke v. Northern Trust Company, May v. Heiner, and McCormick v. Burnet, or some of them. Thus, when the question came before this court again in the St. Louis cases, there was a substantial body of authority following and applying the Heiner and McCormick cases.

Since the St. Louis cases were decided, the principle on which they went has been repeatedly applied by the Board of Tax Appeals and the courts. The Board has followed the cases in no less than seventeen instances.8

*129The record is the same in the courts. The St. Louis cases have been followed in fourteen cases.9 In some of these the Government has sought review in this court but in none, except those now presented, has it asked the court to overrule those decisions.

If there ever was an instance in which the doctrine of stare decisis should govern, this is it. Aside from the obvious hardship involved in treating the taxpayers in the present cases differently from many others whose cases have been decided or closed in accordance with the settled rule, there are the weightier considerations that the judgments now rendered disappoint the just expectations of those who have acted in reliance upon the uniform construction of the statute by this and all other federal tribunals; and that, to upset these precedents now, must necessarily shake the confidence of the bar and the public in the stability of the rulings of the courts and make it impossible for inferior tribunals to adjudicate controversies in reliance on the decisions of this court. To nullify more than fifty decisions, five of them by. this *130court, some of which have stood for a decade, in order to change a mere rule of statutory construction, seems to me an altogether unwise and unjustified exertion of power. As I shall point out, there is no necessity for such action because it has been, and still is open to Congress to change-the rule by amendment of the statute, if it deems such action necessary in the public interest.

3. Section 301 of the Revenue Act of 1926 imposes a tax upon the value of the net estate of a decedent. Section 302 provides the method for determining the value of the gross estate. Subsections (c) (d) (e) (f) and (g) require inclusion in the gross estate of interests which otherwise might be held not to form a part of the decedent’s estate or not to pass from him . to others at his death. These subsections sweep such interests into the grpss estate in order to forestall tax avoidance. Section 302 (c) was the successor of analogous sections in earlier acts and the predecessor of similar sections in later acts.10 The subsection has been amended in successive Revenue Acts. As a result of the Treasury’s experience in the enforcement of the law, Congress has from time to ktime thought it necessary to extend the scope of the subsection in the interest of more efficient administration. Within constitutional limits spch extension is a matter of legislative policy for Congress alone.11

It is familiar practice for Congress to amend a statute to obviate a construction given it by the courts. The legislative history of § 302 (c) demonstrates that Congress has elected not to make such 'an amendment to *131meet the construction placed upon it by this court in the St. Louis cases.

May v. Heiner was decided in 1930. The Treasury' was dissatisfied with the decision and in three later cases attacked the ruling, amongst- them McCormick v. Burnet. The court announced its judgments in these cases on March 2, 1931, reaffirming May v. Heiner. On the following day Congress adopted a joint resolution amending § 302 (c) to tax a transfer with reservation of a life estate to the grantor, but, in so doing, it omitted to deal, with a contingent interest reserved to the grantor or the possibility of reverter remaining in him, involved in both Heiner and McCormick. See Hassett v. Welch, 303 U. S. 303, 308-9. The omission is significant.

It may be argued that in the haste of preparing and passing the amendment the point was overlooked. But the joint resolution was reenacted by § 803 of the Revenue Act of 1932,12 without any alteration to cover- the point. The Revenue Act of 193413 amended § 302 (d) of the Revenue Act of 1926 but did not change § 302 (c) as it then stood.

The day the St. Louis cases were decided, this court announced its opinion in White v. Poor, 296 U. S. 98, construing § 302 (d) of the Act of 1926. In order to make the seetioñ apply to such a situation as was disclosed in that case 14 the Congress, on June 22, 1936, by the Act of 1936,15 amended it -to preclude the construction the court had given it. Again Congress let § 302 (c) stand as before and as construed in the St. Louis cases. *132Three revenue acts have since been adopted,16 in none of which has the wording of § 302 (c) been altered. If there is any life in the doctrine often announced that reenactment of a statute as uniformly construed by the courts is an adoption by Congress of the construction given it, this legislative history ought to be conclusive that the statute, as it now stands, means what this court has said it means.

Little weight can be given to the argument of the Government that the Treasury has not applied to Congress for alteration of the section because of the difficulty of wording a satisfactory amendment. A moment’s reflection will show that it would be easy to phrase such an amendment. Whatever the reason; for the failure) to amend. § 302 (c), whether hesitancy on the part of the Treasury to recommend such action, or the satisfaction of Congress with the-construction put upon the sectiomby this court, or mere inadvertence, the- fact remains that the section has been reenacted again and again with the courts’ construction plain for all to read.

4. As shown by the matter .aboye quoted from the Treasury Regulations affecting ’ the estate tax,17 a contingent interest is not to be included in the taxable estate. In. the light of this construction, estate tax provisions were reenacted or amended in 1921, 1924, 1926, 1928, 1931, 1932, 1934, 1935, 1936 and 1937.

At the bar, counsel for the Government stated that it had always been the view of the Treasury that the article in question applied only to § 302 (a) and had no application to § 302 (c). But we are not concerned with what the Treasury thought about the matter. The regulations were issued to guide taxpayers in complying with the Act. Section 302 is an entirety. Subsections (a) and (c) were *133not intended to contradict each other, but the latter was to supplement the former. The gross estate was to be computed according to the section as a whole. It is hard to understand how the taxpayer was expected to discriminate between a contingent interest of a decedent under the will of his grandmother and a similar interest under an absolute deed executed by him inter vivos. If the one did not pass from the decedent at death neither did the other.

After the decisions in the St. Louis cases, the Treasury rendered its regulations even more explicit. In Regulations 80 (Revised), promulgated October 26, 1937, a new Article 17 was inserted which is:

“The statutory phrase, ‘a, transfer . . . intended to-take effect in possession or enjoyment at or after his death,’ includes a transfer by the decedent . . . whereby and to,the extent that the beneficial title to the property ... or the legal title thereto . . . remained in the decedent at the time of his death and the passing thereof was subject to the condition precedent of his death. . . .

“On the other hand, if, as a result of the transfer, there remained in the decedent at the. time of his death no title or interest in the transferred property, then no part of the property is to be included in the gross estate merely by reason of a provision in the instrument of transfer to the effect that the property, was to revert to the decedent upon the. predecease of some other person or persons or the happening of some other event.”

If theretofore doubt could havé been entertained, it then must have vanished. And with this regulation in ■force, Congress reenacted § 302 (c) as so interpreted.

What, then, is to be said of the principle, that reenactment of a statute which the Treasury, by, its regulations, has interpreted in a given sense is an embodiment of the interpretation in the law as reenacted? purely the principle cannot be avoided, as the Government argues, be*134cause the Treasury felt bound so to interpret § 302 (c) by reason of this court's decisions. That fact should make application of the principle the more urgent.

concurs in the result upon the ground that each of these cases is controlled by our decision in Klein v. United States, 283 U. S. 231.