An agent has authority, in an emergency, to do all such acts for the purpose of protecting his principal from loss as would be done by a person of ordinary prudence, in his own case, under similar circumstances.
     Illustrations
     (a) An agent for sale may have goods repaired if it be necessary.
     (b) A consigns provisions to B at Calcutta, with directions to send them immediately to C, at Cuttack. B may sell the provisions at Calcutta, if they will not bear the journey to Cuttack without spoiling.