In the work just mentioned few details are given; but even the more elaborate classification of birds contained in his Lecons d'anatomie comparee of 1805 is based wholly on external characters, such as had been used by nearly all his predecessors; and the Regne Animal of 1817, when he 1 This was reprinted in 5882 by the Willughby Society.
Yet over and over again his determination of the affinities of several groups even of European birds was disregarded; and his labours, being contained in a bulky and costly work, were hardly known at all outside of his own country, and within it by no means appreciated so much as they deserved '-for even Naumann himself, who gave them publication, and was doubtless in some degree influenced by them, utterly failed to perceive the importance of the characters offered by the song-muscles of certain groups, though their peculiarities were all duly described and recorded by his coadjutor, as some indeed had been long before by Cuvier in his famous dissertation 2 on the organs of voice in birds (Lecons d'anatomie comparee, iv.
Cuvier (Lecons d'anatomie comparee, 1800-1805), and in England by W.
In 1802 appeared the Traite d'anatomie et de physiologic vegetale of C.F.
His chief works are Anatomie descriptive (1834-1836); Anatomie pathologique du corps humain (1829-1842), with many coloured plates; Traite d'anatomie pathologique generale (1849-1864); Anatomie du systeme nerveux de l'homme (1845); Traite d'anatomie descriptive (185 1).