delivered the opinion of the Court:

The sole question here involved is Avhether the payment of the principal sum of the purchase price by a vendee under a contract of conditional sale providing for the payment of principal and interest, and the acceptance of the principal by the *45vendor, waives interest thereon, and vests the title to the property in the vendee without the payment of interest. This is not an action in assumpsit for the recovery of interest in the nature of damages, but is an action upon an express contract in which the interest forms a part of the consideration.

In actions for the recovery of interest after the payment of the principal has been made, the distinction is well defined; and we think the rxxle has no exception, that where interest is specified to be paid as a part of the consideration named in the contract, payment of the principal does not constitute a presumption of waiver of the interest; but where there is no provision in the contract for the payment of interest, and it can only be recovered by way of damages as an incident of the failure to pay the principal when due, an acceptance of the principal will presume a waiver of the interest, and a separate action cannot subsequently be sustained for the recovery of the interest.

In Southern C. R. Co. v. Moravia, 61 Barb. 180, the court, after calling attention to the rule that where interest is not specified in the contract, it is only an incident of the debt, and may be waived by acceptance of the principal, said: “A distinction has been made between such cases and those whore, interest was made payable by the terms of the contract. In the latter case the interest is as much a part of the contract as the principal. It is not a mere incident which may be awarded by way of damages, but a substantive part of the contract, which may be enforced after the debt has been otherwise paid. Fake v. Eddy, 15 Wend. 76. If the account is composed of principal and interest, and the payments are received upon account merely, the part remaining unpaid upon the whole account will be regarded as principal, and an action will lie to recover it.” In Fake v. Eddy, supra, the court said: “But where there is an express agreement to pay the interest as well as the principal of the plaintiff’s demand, I apprehend that the performance of one part of the agreement would be no bar to an action for the nonperformance of another part thereof.”

The holding of the New York court is in perfect accord with *46Stewart v. Barnes, 153 U. S. 456, 38 L. ed. 781, 14 Sup. Ct. Rep. 849, chiefly relied upon by counsel for defendant. In that case Stewart had paid an illegal revenue tax, and had accepted a refund of the exact amount collected. He then brought an action to recover interest thereon, and the court held that by acceptance of the principal sum, he waived his right to sue for interest as incidental damages. In its opinion, the court said: “Where money is retained by one man against the declared will of another, who is entitled to receive it, and who is thus deprived of its use, the rule of courts in ordinary cases is, in suits brought for the recovery of the money, to allow interest as compensation to the creditors for such loss. Interest in such cases is considered .as damages, and does not form the basis of the action, but is an incident to the recovery of the principal debt. The right of action is the right to compel the payment of the money which is being retained.. When he who has this right commences an action for its enforcement, he at the same time acquires a subordinate right, incident to the relief which he may obtain, to demand and receive interest. If, however, the principal sum has been paid, so that, as to it, an action cannot be maintained, the opportunity to acquire a right to damages is lost.” To the same effect are Redfield v. Ystalyfera Iron Co. 110 U. S. 174, 28 L. ed. 109, 3 Sup. Ct. Rep. 570; and Redfield v. Bartels, 139 U. S. 694, 35 L. ed. 310, 11 Sup. Ct. Rep. 683.

We have before us a valid, enforceable, and subsisting contract of conditional sale, with delivery of the property to the vendee (Harkness v. Russell, 118 U. S. 663, 30 L. ed. 285, 7 Sup. Ct. Rep. 51), under the terms of which title to the property remains in the vendor until the consideration in full, composed of both principal and interest, is paid. Such payment is a condition precedent to the passing of title. It is immaterial' how the desultory payments of the vendee were applied. The liability of the purchaser under such a contract cannot be discharged by any mere fiction of bookkeeping. The principal and interest together form the consideration; and the obligation, under the terms of the contract, to pay the one is as bind*47ing as to pay the other. The defendant can no more claim a waiver of the interest upon payment of the principal than he could claim a waiver of the principal upon payment of the interest. They both form the consideration named in the contract, and the contract can only be discharged by their payment in full, or by a release, for valuable consideration, of the claim, in whole or in part.

We think this distinction between the right of separate action to recover interest as a stipulated part of the consideration, as in the present case, and a right of action to recover interest as a mere incident to the debt, as damages for failure to pay the principal consideration, is a fixed rule in this country, to which there is no exception. We have found no authority to the contrary.

The judgment is reversed, with costs, with directions to grant a new trial. Reversed.