The important change which they (the sponsors) proposed to make from the provisions of the tariff of 1846 was to substitute specific for ad-valorem duties. Such a change from ad-valorem to specific duties is in itself by no means objectionable; but it has usually been made a pretext on the part of protectionists for a considerable increase in the actual duties paid. When protectionists make a change of this kind, they almost invariably make the specific duties higher than the ad-valorem duties for which they are supposed to be an equivalent... The Morrill tariff formed no exception to the usual course of things in this respect. The specific duties which it established were in many cases considerably above the ad-valorem duties of 1846. The most important direct changes made by the act of 1861 were in the increased duties on iron and on wool, by which it was hoped to attach to the Republican party Pennsylvania and some of the Western States"