75. Agent to perform business undertaken.

The primary duty of an agent is to carry out, generally in person1, the business he has undertaken2, or to inform his principal promptly if it is impossible to do so3.

If the agent is given definite instructions from his principal as to the manner in which the business is to be carried out, he must follow them strictly4, provided that they are lawful5; and, if he does so, he will not be liable to his principal merely because the consequences differ from those which the principal had expected