If a man goes through the form of making a contract with A through B as A's agent, and B is not in fact the agent of A, there is no contract, because there is only one party. The promise offered to A has not been accepted by him, and no consideration has moved from him. In such a case, although there is generally mistake on one side and fraud on the other, it is very clear that no special [309] doctrine need be resorted to, because the primary elements of a contract explained in the last Lecture are not yet present. Take next a different case. The defendant agreed to buy, and the plaintiff agreed to sell, a cargo of cotton, "to arrive ex Peerless from Bombay." There were two such vessels sailing from Bombay, one in October, the other in December. The plaintiff meant the latter, the defendant the former. It was held that the defendant was not bound to accept the cotton. /1/ It is commonly said that such a contract is void, because of mutual mistake as to the subject-matter, and because therefore the parties did not consent to the same thing. But this way of putting it seems to me misleading. The law has nothing to do with the actual state of the parties' minds. In contract, as elsewhere, it must go by externals, and judge parties by their conduct. If there had been but one "Peerless," and the defendant had said "Peerless" by mistake, meaning "Peri," he would have been bound. The true ground of the decision was not that each party meant a different thing from the other, as is implied by the explanation which has been mentioned, but that each said a different thing. The plaintiff offered one thing, the defendant expressed his assent to another. A proper name, when used in business or in pleading, /2/ means one individual thing, and no other, as every one knows, and therefore one to whom such a name is used must find out at his peril what the object designated is. If there are no circumstances which make the use deceptive on either side, each is entitled to insist on the [310] meaning favorable to him for the word as used by him, and neither is entitled to insist on that meaning for the word as used by the other. So far from mistake having been the ground of decision, as mistake, its only bearing, as it seems to me, was to establish that neither party knew that he was understood by the other to use the word "Peerless "in the sense which the latter gave to it. In that event there would perhaps have been a binding contract, because, if a man uses a word to which he knows the other party attaches, and understands him to attach, a certain meaning, he may be held to that meaning, and not be allowed to give it any other. /1/