An act to permit the free importation of certain raw hides and skins from Ireland and the British plantations in America, for a limited time, and for taking off the duties upon seal skins tanned or tawed in this kingdom, and for granting another duty in lieu thereof, for indemnifying all persons with respect to advising or executing any of His Majesty's orders of council prohibiting the importation of raw hides, horns, and hoofs, of infected cattle, and to authorize the prohibition of the importation of such hides, horns, and hoofs, for the futre