Section 26. (a.)—When any bill of exchange, promissory note, cheque or order for the payment of money on demand

26. (a.)—When any bill of exchange, promissory note, cheque or order for the payment of money on demand by any banker or person acting as a banker, chargeable hereunder with the duty of one anna, comes to his hands unstamped, he may affix thereto the necessary adhesive stamp, and cancel the same in the manner required by this Act, and upon so doing, may charge the duty against the person who ought to have paid the same, or deduct such duty from the sum so directed to be paid. (b.)—Such bill, note, cheque, or order shall, so far as relates to the stamp-duty chargeable thereon, be valid; but this shall not relieve any person or firm from liability to the penalty which he or it may have incurred by issuing or giving the said bill, note, cheque, or order unstamped.