THE MODERN STUDY OF ZOOLOGY 



ever known. Aristotle, like Solomon, is better 

 known in connection with other branches of know- 

 ledge than zoology ; still he devoted much attention 

 to the study of animals, and placed zoology on a 

 far more scientific basis than his predecessors had 

 done. It would appear that Aristotle never drew 

 up a formal scheme of classification ; the system 

 commonly ascribed to him, which is in reality 

 compiled from his various writings and was never 

 given by him in its modern form, is as follows,* 

 the modern equivalents of the several groups being 

 indicated in the right hand column. 



A. Animals with red blood and a 



backbone 



1. Provided with four legs. 



(a) Viviparous . 



(b) Oviparous . 



2. Provided with two legs 



and two wings . 



3. Devoid of legs, but pro- 



vided with fins 



B. Animals without red blood and 



with no backbone . 



1. Soft externally 



2. Soft internally, hard ex- 



ternally . 



Vertebrata. 



Mammalia. 

 Reptilia. 



Aves. 

 (Pisces. 

 \ Cetacea. 



Invertcbrata. 



Mollusca. 



Crustacea. 



Testacea. 



Insecta. 



Such a classification is manifestly based on a 



* Vide Claus : " Grundzuge der Zoologie " : French Translation 

 by Moquin-Tandon. Note B., p. 1099. 



