LECTURE I. 15 



degree of iin-rit, ;ml perhaps may he allowed 

 to be tin- mo-4 truly philosophic that ha- \ et l>een 

 p , it. 



Monsieur Cuvicr di\ ides the whole animal world 

 into what he calls Vertebrated and IH.->TU '>rated 

 animals ; that is, Mich as are furnished with a back- 

 bom , divided into the joints called vertebrae, and 

 forming a case, or guard for the spinal marrow, 

 and into such as are destitute of this series of 

 bones, and are therefore Invertebrated animals. 

 His first class, viz. the Vertcbratcd animals, are 

 subdivided into such as have warm blood and a 

 heart with two cavities or ventricles, and into such 

 as have comparatively cold blood, and a heart with 

 one ventricle. In the first division then of Verte- 

 brated animals rank Quadrupeds and Birds, and in 

 the second, or such as have cold blood and a 

 single ventricle, rank the Linnajan Amphibia and 

 Fishes. 



The second great class, consisting of the Iirccr- 

 tebratcd animals, or such as are destitute of the 

 .spine or back-bone, is divided into such as have a 

 system of blood-u >M Is for the purpose of circu- 

 lation, and Midi as have none. 



The first of these divisions, or that consisting of 



