An Act to amend an Act, intituled, “An Act to prevent the further sudden increase of Free Negroes and Mulattoes;” and also to amend an Act, intituled, “An Act for the better government of Slaves, and for the more speedy and effectual suppression of runaway Slaves; and to ascertain what shall be evidence of the sealing of certificates respecting enfranchisement, as directed to be made by the guardians of Slaves.”