18. Direction as to duty in cases of certain conveyances

When any property has been contracted to be sold for one consideration for the whole, and is conveyed to the purchaser in separate parts by different instruments, the consideration shall be apportioned in such manner as the parties think fit, provided that a distinct consideration for each separate part is set forth in the conveyance relating thereto, and such conveyance shall be chargeable with ad valorem duty in respect of such distinct consideration.

When property contracted to be purchased for one consideration for the whole, by two or more persons jointly, or by any person for himself and others, or wholly for others, is conveyed in parts by separate instruments to the persons by or for whom the same was purchased, for distinct parts of the consideration, the conveyance for each separate part shall be chargeable with ad valorem duty in respect of the distinct part of the consideration therein specified.

When a person having contracted for the purchase of any property but not having obtained a conveyance thereof, contracts to sell the same to any other person and the property is in consequence conveyed immediately to the sub-purchaser, the conveyance shall be chargeable with

When a person, having contracted for the purchase of any property but not having obtained a conveyance thereof, contracts to sell the whole, or any part thereof, to any other person or persons and the property is in consequence conveyed by the original seller to different persons in parts, the conveyance of each part sold to a sub-purchaser shall be chargeable with ad valorem duty in respect only of the consideration paid by such sub-purchaser, without regard to the amount or value of the original consideration; and the conveyance of the residue (if any) of such property to the original purchaser shall be chargeable with ad valorem duty in respect only of the excess of the original consideration over the aggregate of the considerations paid by the sub-purchaser:

When a sub-purchaser takes an actual conveyance of the interest of the person immediately selling to him, which is chargeable with ad valorem duty in respect of the consideration paid to him and is duly stamped accordingly, any conveyance to be afterwards made to him of the same property by the original seller shall be chargeable with a duty equal to that which would be chargeable on a conveyance for the consideration obtained by such original seller, or where such duty would exceed $10 with a duty of $10.