193. Third person led to believe in authority.

The cases in which notice of termination has been held to be necessary are, in general, cases in which a third person had been induced to believe through the act of the principal that the agent had authority, and therefore depend on the principle of apparent authority1. The belief may have been induced through the principal giving the agent express authority to do certain acts2, or through his having ratified the agent's acts3. In such cases, in the absence of actual notice, or of constructive notice by lapse of time or other indications