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344 so far as concerns the theory of agreement. But a Quasi-Contract is not a contract at all. The commonest sample of the class is the relation subsisting between two persons one of whom has paid money to the other through mistake. The law, consulting the interests of morality, imposes an obligation on the receiver to refund, but the very nature of the transaction indicates that it is not a contract, inasmuch as the Convention, the most essential ingredient of Contract, is wanting. This word "quasi," prefixed to a term of Roman law, implies that the conception to which it serves as an index is connected with the conception with which the comparison is instituted by a strong superficial analogy or resemblance. It does not denote that the two conceptions are the same or that they belong to the same genus. On the contrary, it negatives the notion of an identity between them; but it points out that they are sufficiently similar for one to be classed as the sequel to the other, and that the phraseology taken from one department of law may be transferred to the other and employed without violent straining in the statement of rules which would otherwise be imperfectly expressed.

It has been shrewdly remarked, that the confusion between Implied Contracts, which are true contracts, and Quasi Contracts, which are not contracts at all, has much in common with the famous