159. Identity of principal disclosed.

159.     Identity of principal disclosed.

Where an agent in making a contract discloses both the existence and the name of a principal on whose behalf he purports to make it, the agent is not, as a general rule, liable on the contract to the other contracting party1, whether he had in fact authority to make it or not2; but a personal liability may be imposed upon him by the express terms of the contract3, by the ordinary course of business4, or by usage5, and he will be liable for