(1) Where, by this Act, any instrument or writing is required to be signed by any person it is not necessary that he should sign it with his own hand, but it is sufficient if his signature is written thereon by some other person by or under his authority.

(2) In the case of a corporation, where, by this Act, any instrument or writing is required to be signed, it is sufficient if the instrument or writing be sealed with the corporate seal.

But nothing in this section shall be construed as requiring the bill or note of a corporation to be under seal.