62 STUDY OF NATURAL HISTORY. 
every ichthyologist, is, of necessity, so expensive. 
There is, however, a smaller edition in octavo*, in 
six parts or volumes, with 216 coloured plates, which, 
so far as it extends, is equally useful with the folio 
edition. Bloch has the great excellency of describing 
such species only as he had himself seen; a rare 
quality in the writers of this period, when compilations 
began to be made in the shape of general systems, 
which almost brought us back to the age of Gesner 
and Aldrovandus. Schneider}, however, who pub- 
lished what he termed the system of his friend, after 
his death, added separately in two volumes the species 
described by other authors:. but this work we have 
not seen. Bloch was also the author of a volume on 
the intestinal worms.{ His continuator, Professor 
Schneider, was also attached to the study of the 
Amphibia, upon which he wrote some dissertations of 
great merit §; particularly on the Tortoises, a tribe 
which was again illustrated in 1792 by the coloured 
plates of Schcepf. || 
(27.) Ornithology, as will subsequently appear 
had been much attended to by the disciples of Buffon ; 

* Tdem, en six parties, avec 216 planches. Berlin, 1796 
Svo. 
+ J. G. Schneider. Systema Ichthyologiz de Bloch. 2 vols. 
8vo. avec 110 fig. Berlin, 1801. (Cuvier.) 
+ Traité sur la Génération des Vers Intestines. Berlin, 
1782. 4to. 
§ Schneider. General Natural History of the Tortoises 
(in German). Leipzig, 1783. 8vo.— Amphibiorum Phy- 
siologie Specim. 1 et 2. Zullichau, 1797. 4to. 
| Schepf. Historia Amphibiorum, Naturalis et Litteraria. 
Fas. 1. et 2. Jena, 1799 and 1801. 8vo. — Historia Tes- 
tudinum Iconibus illustrata. Erlang. 1792. 4to, 
