21. Disclosure by agent effecting insurance.- Subject to the provisions of the preceding section as to circumstances which need not be disclosed, where an insurance is effected for the assured by an agent, the agent must disclose to the insurer- (a) every material circumstance which is known to himself, and an agent to insure is deemed to know every circumstance which in the ordinary course of business ought to be known by, or to have been communicated to, him; and (b) every material circumstance which the assured is bound to disclose, unless it comes to his knowledge too late to communicate it to the agent. | 
