You will see that by sect. 7 ad valorem duties are to be
calculated according to the value of the article at place of
shipment. This no doubt establishes in effect a system of diff
duties. But it was shewn, when the last Customs Act, which
contained a similar clause, was
under consideration, that
this mode of levying duties was adopted in some of the colonies
(6015 & 4650
B Columbia); and in another case a Report of the
Customs Commissioners was sent here in which (I think) it was
stated that the practise was not objectionable. (5517 Treasury
Gambia.) These papers are sent on with 10834
B. Columbia.