“If it shall be held that these emoluments are derived from the vassals, and that the expense of employing the respondent's agent in drawing the deeds is, to a certain extent, an addition to what would have been necessary if they had employed their own agents, where is the hardship? In that case it just resolves into a species of tax upon each transference, which, from the terms of the original feu-contract, they must have seen they were bound to pay. But if, in another view, and which the respondent rather takes to be the true one, this circumstance, like every other burden, was taken into consideration by each vassal in fixing the feu-duty which he was bound to pay, then the lucrative office is in truth one of which the emoluments are defrayed by the superior himself, in the shape of a diminution from that feu-duty which he would otherwise have drawn.”