Generally speaking, and apart from statute, contract in English law is formless, that is to say, no special form is required; a contract for valuable consideration is enforceable although there is no seal, or no writing, and even though the contract is merely implied from conduct. There is an exception in the case of contracts of corporations, which according to the old rule must be under seal. This rule has, however, been to a large extent eaten up by exceptions.

The general principle that no special form is required for a contract of sale is expressed in the Sale of Goods Act (Ont. s. 5 ; U. K. s. 3), as follows:

5. Subject to the provisions of this Act and of any statute in that behalf a contract of sale may be made in writing, either with or without seal, or by word of mouth or partly in writing and partly by word of mouth, or may be implied from the conduct of the parties; Provided that nothing in this section shall affect the law relating to corporations.