Section 12. The said Society shall continue to have the same exclusive property in and control over their said L

12. The said Society shall continue to have the same exclusive property in and control over their said Library, Manuscripts, Maps, Coins, Busts, Pictures and Engravings, which they at present possess, and the Council of the said Society shall have the exclusive possession, occupation and control, for the purposes of the said Society, of those portions of the said building which shall, upon its completion, be set apart for the accommodation of the said Society and the reception of their Library and other property mentioned in Section 4 of this Act.