The defendant appeals from a judgment in the Superior Court ordering that she specifically perform an agreement for the purchase and sale of a house and lot in Provincetown. The agreement, between the plaintiffs (husband and wife) as buyers and the defendant as seller, is on a stationer’s printed form and provides:

“and for such deed and conveyance the party of the second part is to pay the sum of

twenty-seven thousand ($27,000.00) --------------dollars

of which one hundred ($100.00) --------------dollars have

been paid this day, twenty-six

THOUSAND NINE HUNDRED (26,900.00) ---------------dollars

balance in cash on delivery of said deed.”1

This clause is followed by a typewritten provision (the mortgage assumption clause): “It is agreed between the parties that the purchasers shall assume and agree to pay the balance due on the existing mortgage with Cape Cod Cooperative Bank as part of the consideration of this sale and to save the seller harmless on account thereof.”

The trial judge ordered that the defendant convey the property to the plaintiffs “free from all encumbrances, upon the[ir] ... paying the sum of $27,000.00.” He made this determination on the basis of conflicting oral testimony regarding the purchase price, ruling that “the statement as to the purchase price contained in said agreement is ambiguous and that parol evidence was admissible ... to assist the Court in interpreting this language.” He found that the defendant had offered the property to the plaintiffs “for the mortgage,” which was in the amount of $27,000, rather than for $54,000 (the cash plus the mortgage) which the defendant testified she understood the price to be. We hold that the judgment cannot stand.

The provisions of the agreement relative to the consideration to be furnished by the buyers are sufficiently clear *549and unambiguous to preclude the use of oral testimony to control their meaning. “Interpretation is directed to the meaning of the terms of the writing in the light of the circumstances, not to the meaning of the conversations of the parties in the course of their negotiations.” Robert Indus. Inc. v. Spence, 362 Mass. 751, 755 (1973). Dekofski v. Leite, 336 Mass. 127, 129-130 (1957). See Bray v. Hickman, 263 Mass. 409, 412-415 (1928); Berman v. Geller, 325 Mass. 377, 379-380 (1950); Aerostatic Engr. Corp. v. Szczawinski, 1 Mass. App. Ct. 141, 142-143 (1973). Cf. Imper Realty Corp. v. Riss, 358 Mass. 529, 534-535 (1970). The choice between the alternative possible interpretations which the plaintiffs suggest does not require the use of parol evidence; it may be made without difficulty from the instrument itself. As set out above, the instrument provides in a separate clause that $27,000 is to be paid “in cash.” The following paragraph, also a separate clause, provides that “as part of the consideration of this sale” the buyers are to assume and agree to pay the mortgage. There is nothing to indicate that these two clauses are disjunctive as the plaintiffs argue. And if something more than the seriatim listing of the two clauses were needed to indicate that they were conjunctive, it is found in the characterization of the plaintiff’s obligation in the mortgage assumption clause as “part of the consideration.” It is significant that this phrase is also used in the provision for the sale of personal property, which is obviously in addition to the provision for the real estate.2 See Rhoades v. Secunda, 296 Mass. 1, 3 (1936). Cf. Bray v. Hickman, 263 Mass. at 414-415; Flynn v. Kenrick, 285 Mass. 446, 448-449 (1934).

We note that in each of the last two cases cited a total consideration is explicitly stated to include both cash and the assumption of a mortgage. This appears to be the more usual method of setting out the total consideration and its component parts; but it has no application in this case in *550which $27,000 is explicitly stated to be payable in cash (see Pearlstein v. Novitch, 239 Mass. 228, 230-231 [1921]), thus excluding from its scope the assumption of the mortgage which, however, must also be given effect “as part of the consideration.” This agreement is quite simply one for the purchase and sale of the equity of redemption over and above the $27,000 mortgage. Lively v. Rice, 150 Mass. 171, 173 (1889).* *3 See Fiske v. Tolman, 124 Mass. 254, 257 (1878).

We thus conclude that the total consideration for the conveyance was comprised of $27,000 in cash plus the assumption of the mortgage. Since this emerges unambiguously from our analysis of the instrument itself, parol evidence cannot be used to vary it. Accordingly, the judgment is reversed, and the case is remanded to the Superior Court, where the plaintiffs shall be permitted to amend their complaint to allege the agreement as we have construed it; upon such amendment the agreement shall be specifically enforced by an appropriate judgment.4 If such an amendment is not filed within thirty days after the issuance of our rescript (since the defendant has not asked for affirmative relief) the action is to be dismissed.

So ordered.