79.—(1) An appointment made by will, in exercise of any power, shall not be valid unless it is executed in accordance with this Act.

(2) Every will so executed shall, so far as concerns its execution and attestation, be a valid execution of a power of appointment by will, notwithstanding that it has been expressly required that a will made in exercise of such power shall be executed with some additional or other form of execution or solemnity.