Treviranus, Gottfried Reinhold. Biologie, oder Philosophie der lebenden Natur für Naturforscher und Aerzte (2 vols). Gottingen: Johann Friedrich Rower, 1814 & 1822. 
Two volumes in half leather, marbled boards, end papers & page edges, 20 x 12.5 cm. Both bindings have scuff marks on the top boards, otherwise very good. 579 & 662 pp., folding charts. Good. Hardcover.
The fourth & sixth volumes of the series, which was published in parts from 1802 to 1822. Two volumes of the author's famous work on natural history, considered to be a pre-Darwin statement of evolutionary theory, namely, that of transmutation of species.