There is little or no contest about the facts of this case, which are: that the defendant Culverwell purchased from the estate of Russ certain lots in San Francisco, and borrowed the money from one Meyer to pay for them, and as a security for the loan, it was agreed that the vendor should convey the *293property by absolute deed to Meyer, to be by him. conveyed to Culverwell on payment of the amount advanced, Avith interest. In accordance with this arrangement, the title was conveyed to Meyer by deed absolute, which was. intended, hoAvever, to be only in the nature of a mortgage, and was treated by the parties as such. On the faith of this security, Meyer made further advances to Culverwell, so that on the 17th of February, 1866, there was due from Culverwell to Meyer, in the aggregate, the sum of seven thousand five hundred dollars. In order to discharge this indebtedness, Culverwell negotiated a loan from the California Insurance Company for nine thousand dollars, of Avhich sum it was agreed that seven thousand five hundred dollars should be applied to extinguish the debt of Meyer, and that Meyer should then, simultaneously, convey the property to Culverwell, by deed, who should, at the same time, make a mortgage on it to the insurance company, to secure the payment of the nine thousand dollars, with interest. This agreement was carried into effect. The insurance company paid the debt due to Meyer, and advanced to Culverwell the further sum of one thousand five hundred dollars, and thereupon Meyer conveyed the property to Culverwell, who immediately made a mortgage on it to the insurance company, to secure the nine thousand dollars. Subsequently, Culverwell paid to the insurance company five thousand dollars, which was credited on the mortgage debt; after which the insurance company assigned the mortgage and balance due of the mortgage debt to the plaintiff Doe, who brings this action to foreclose the mortgage, making Knight and wife, amongst others, parties defendant. The defendants Knight and wife filed an answer and cross complaint, in Avhich the wife sets up an alleged equity to one of the lots, founded on the following facts, to wit: That the wife of Culverwell and Mrs. Knight are sisters, and that in the years 1861 and 1862 Culverwell received from Germany certain moneys belonging to his wife and Mrs. Knight, which he used in his oavh business, with the consent of Mrs. Knight, on his promise to account to her *294for her share of it; that on account of this indebtedness, he subsequently agreed, orally, to purchase a lot and build a house on it for her, and that the house and lot should be her property, but no price was ever agreed upon, nor was there any settlement or accounting between them; that when he purchased the lots from the Buss estate he pointed out one of them as the lot she was to have; and in the Summer of 1865, whilst the title stood in Meyer’s name, erected a dwelling house upon it, consulting Mrs. Knight about the plan of the building; and on the completion of the house, in July, 1865, she and her husband entered into possession of it, and have ever since occupied it, with the consent of Oulverwell, during all of which time she has claimed that the house and lot belonged to her.
On this state of facts, the District Court decided that Mrs. Knight had no equities superior to the plaintiff’s, and entered judgment of foreclosure in the usual form, but with a provision that the remainder of the mortgaged premises be first sold, and that said house and lot be sold under the judgment only in the event that the remainder of the property proved to be insufficient to satisfy the mortgage debt, interest, and costs.
Knight and wife have appealed from this judgment, and insist, first, that Mrs. Knight has an equitable title to the house and lot which is superior to plaintiff’s, and is entitled to priority over it: second, that at all events her equities are prior in respect to the one thousand five hundred dollars advanced by the insurance company to Oulverwell, and that the five thousand dollars paid by him to the insurance company should be credited on the seven thousand five hundred dollars paid to Meyer, and not upon the entire nine thousand dollars due to the company.
¡Neither of these propositions is tenable. The transaction between Oulverwell and Mrs. Knight created no equitable title in her to the house and lot which could have been enforced in a Court of equity, even as against Oulverwell, supposing the title to have been in him.. The transaction *295amounted only to this: that Culverwell was indebted to Mrs. Knight, and in consideration thereof promised to purchase a lot and erect a house upon it for her, and that the property should be hers. There was no settlement of accounts between them, no agreement as to the price of the lot, no stipulation as to the cost and character of the building, nor, in fact, any of the elements'of a contract of which a Court of equity could decree the specific performance. It was simply a vague understanding that he would purchase some kind of a lot and erect some sort of a house upon it for her. To be obligatory on either party, a contract must be mutual and reciprocal in its obligations. If Mrs. Knight, after entering into the occupation of the house and lot, had seen fit to abandon the possession, and had brought an action against Culverwell to recover the money due to her, the vague conversation which occurred between them in respect to the house and lot would have constituted no defense to the action; and if Culverwell had sued her to enforce a specific performance of- the' alleged contract, it would have been a sufficient answer for her to have said: “There is no contract; I never agreed to.release you from the debt, nor to accept the house and lot in full payment, nor in payment of any specific sum; it was only a loose conversation, which assumed no definite shape, and was obligatory on neither of us.”
It is unnecessary to cite authorities to show that Courts of equity do not attempt to enforce such vague and shadowy claims. But if valid against Culverwell, the claim of Mrs. Knight is obviously without foundation as against the plaintiff. The title was never in Culverwell, except subject to the mortgage to the insurance company. The deed from Meyer to Culverwell, and the mortgage from the latter to the insurance company, was one transaction. The title which he acquired by the deed, eo instants became subject to the mortgage. The money of the insurance company paid the debt to Meyer, and the company, by operation of law, as well as by the express agreement of the parties, became subrogated to the rights of Meyer, which were prior in time and superior *296in equity to any alleged equity which Mrs. Knight could have derived from Culverwell.
It is claimed, however, that the equity founded on subrogation extended only to the seven thousand five hundred dollars paid to Meyer, and that the doctrine of subrogation can have no application to the additional one thousand five hundred dollars advanced by the insurance company to Culverwell. We have already shown that Mrs. Knight acquired no equity which she could enforce, even as against Culverwell, and it is useless to pursue the subject further. But we may add that we know of no principle of law or equity which forbids the application of the five thousand dollars paid by Culverwell first to the payment of the one thousand five hundred dollars, and the remainder as a credit on the balance of the mortgage debt.
Judgment affirmed.