LECTURE IL 



VV E have already seen that Linnaeus has ar- 

 ranged the whole animal world into three great 

 divisions; the first containing such animals as have 

 warm red blood, and a heart divided into two ca- 

 vities, or ventricles; the second containing ani- 

 mals with cold red blood, and a heart with one 

 cavity only; and the third consisting of animals 

 with pale or colourless cold blood, and a heart (as 

 Linnaeus imagined) furnished with a single cavity. 

 The secondary or more particular Linnasan dis- 

 tribution of Animals is thrown into six divisions, 

 the first of which is entitled Mammalia, compre- 

 hending such animals as suckle their young, being 

 furnished with proper organs for that purpose. 

 The second division comprises Birds, The third 

 the Amphibia in the Linnaean sense of the word, 

 comprising the Lizard, Tortoise, Frog, and Ser- 



