indistinctness of thought. And this was not at all necessary; fpr we have another well-authorized technical term exactly adapted to the office of making the true distinction. The latter class are merely constructive contracts, while the former are truly implied ones. In one case the contract is mere fiction, a form imposed in order to adapt the case to a given remedy; in the other it is a fact legitimately inferred. In one, the intention is disregarded; in the other, it is ascertained and enforced. In one, the duty defines the contract; in the other, the contract defines the duty.
We have, therefore, in law three classes of relations called contracts.
' 1. Constructive contracts, which are fictions of law adapted to enforce legal duties by actions of contract, where no proper contract exists, express or implied.
2. Implied contracts, which arise under circumstances which, according to the ordinary course of dealing and the common understanding of men, show a mutual intention to contract.
3. Express contracts, already sufficiently distinguished.
In the present case there is no pretence of a constructive contract, but only of a proper one, either express or implied. And it is scarcely insisted that the law would imply one in such a case as this; yet we may present the principle of the case the more clearly, by showing why it is not one of implied contract.
The law ordinarily presumes or implies- a contract whenever this is necessary to account for other relations found to have existed between the parties.
Thus if a man is found to have done work for another, and there appears no known relation between them that accounts for such service, the law presumes a contract of hiring. But if a man’s house takes fire, the law does not presume or imply a contract to pay his neighbours for their services in saving his property. The common principles of human conduct mark self-interest as the motive of action in the one case, and kindness in the other; and therefore, by common custom, compensation is mutually counted on in one case, and in the other not.
On the -same principle the law presumes that the exclusive possession of land by a stranger to the title is adverse, unless there be some family or other relation that may account for it. And such a possession by one tenant in common is not presumed adverse to his co-tenants, because it is, prima facie, accounted for by the relation. And so of possession of land by a son of the owner. And in Magaw’s Case, Latch 168, where an heir was in a foreign land at the time of a descent cast upon him, and his younger brother entered, he was presumed to have entered for the benefit of the heir. And one who enters as a tenant of the