When any property is conveyed to any person in consideration, wholly or in part, of any debt due to him or subject either certainly or contingently to the payment or transfer of any money or stock or other property whether being or constituting a charge or incumbrance upon the property or not, such debt, money, stock or other property shall be deemed to be the whole or part, as the case may be, of the consideration in respect of which the conveyance is chargeable with ad valorem duty