after stating the case: The first and most essential element of an agreement is the consent of the parties, an
aggregatio
mentium, or meeting of two minds in one and the same intention, and until the moment arrives when the minds of the parties are thus drawn together, the contract is not complete, so as to be legally enforcible. Wald’s Pollock on Contract (3 Ed.), p. 3. It is necessary that the parties should be assured by mutual communication or negotiation that a common intention exists and that they mean the same thing in the same sense.
Ibid.
(1 Ed., 1881), p. 5. It must be remembered, though, that this common intention is a fact, or inference of fact, which, like any other fact, has to be proved according to the general rules of evidence.
Ibid.
(3 Ed.), p. 4. Nor is the contract to be ascertained by what either one of the parties thought it was, but by what'both agreed it should be.
Prince v. McRae,
84 N. 0., 674. The law proceeds not upon the understanding of one of the parties, but upon the agreement of both.
Lumber Co. v. Lumber Co.,
*184
In this case, the difference between the parties is as to the subject-matter of their contract or as to what was sold by one and bought by the other. “It is essential to the validity of a contract that the parties should have consented to the same subject-matter in the same sense. They must have contracted
ad idem ” Utley v. Donaldson,
Let us now apply the prinpiple thus established to the facts of this case. The correspondence plainly shows, as his Honor held, that the parties were mutually mistaken as to what was being sold. The plaintiff advertised for sale the very machine which was shipped to the defendant, it being the one and the only one it proposed to sell at $250. The defendant accepted the proposal, but not according to the terms in which it was made. The plaintiff proposed to sell one thing and the defendant to buy another and quite different thing. There is no other construction to be placed upon the correspondence between the parties. There was a mutual mistake as to an essential matter, and the minds of the parties have therefore not met in one and the same intention. There is no fraud alleged in this case, but nevertheless it results that there was no contract. The defendant, though, has received and converted to his own use the machine shipped to him, and as it was not his property, but belonged to the plaintiff, he is liable for its value, which is admitted to be $250, that being the amount realized from the sale of it by him. Tiffany on Sales, pp’. 108 and 109. In this view .of the case, the counter-claim, as a matter of course, must fail.
It does not appear that there is any machine known in the trade as a “whole-hide measuring machine.” though there may be one of that kind. Assuming that there is, the defendant says in his counter-claim that it is worth $900, and seeks to recover the difference in the price of the two machines. The defendant was conducting a tannery at Stanton, N. C., and intended to use the machine in his business and may be presumed to have had knowledge of the value of such machines. It seems that he expected to buy a machine worth $900 at the much reduced price of $250. The great disparity between the real value of the machine which the defendant thought *186 be was buying and the price at which the plaintiffs machine was advertised for sale, it would seem, was sufficient to excite his inquiry as to whether he and the plaintiff really under-, stood each other, if not to induce the belief that there was a mistake. But however this may be, they did not agree, and there was no sale by which the defendant acquired title to something he did not get, but which, as he alleges, he should have received.
No Error.
