The second major collection acquired by the British Museum, following its formation from the legacy of Sir Hans Sloane, was the herbarium and library of the Karl von Moll purchased by the Trustees in 1816. Von Moll's extensive private library included much early German literature and formed a major acquisition, though most was transferred to the British Library in 1873 under the terms of the British Library Act 1972. Von Moll's herbarium contained collections of Pallas and other contemporary botanists and included his own material, though this was incorporated in the herbarium and lacks obvious distinguishing marks.