LECTURE II. 



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 

 \\i\rm 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 

 Linnanis imagined) furnished with a single cavity. 

 The secondary or more particular Linnaean 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 \vitli proper organs for that purj> 

 The second division comprises Birds. The third 

 the Amphibia in the Linnaean sense of the word, 

 comprising the Lizard, Tortoise, Frog, and Ser- 





