219. Notice given by or to agent.

A notice to quit may be given by the agent of either party, provided that he is duly authorised for that purpose at the time of giving it. If he is not so authorised, a subsequent ratification of the notice after the time for giving it has passed does not make it effective1, as the notice must be one which is, in fact, binding on the landlord when it is served2. Moreover, the tenant must have reason to believe that it is so binding, so that he may safely act on it3. If it is given by an agent