566 BIOLOGY. 



In the Bears the molars are uniform in character, and 

 so on through the Apes up to Man. 



In the Marsupials they are tolerably similar, as also in 

 the Bats and Shrew-mice. 



They are still more alike in the Pig and Horse, and the 

 incisor teeth begin to be wanting in the Ruminantia, 

 e. g. the Ox. 



In Mice the canines are wanting, in the Sloths the 

 front teeth, and in the Ant-eaters actually all. 



3443. In opposition to the perfect eye the general 

 sense of feeling is developed in the tegument. The 

 tegument which is best developed will be that, which 

 represents a self-substantial organ with all its appur- 

 tenances, and thus an organ of touch, whose nobility of 

 rank consists in motion. A skin, which is moveable by 

 means of muscles, must take the noblest rank. A skin 

 with tegmnental muscles is an organ of feeling, which is 

 already in some degree subjected to the influence of the 

 will. If tegumental muscles do not occur in all these 

 animals, they still do in most of them. 



The production of the most perfect coat or covering is 

 the second step, whereby the tegument ascends. 



3444. Hitherto the outer covering of animals was 

 pretty inorganic, consisting either of hollow tracheae, 

 feathers, or semicavernous scales, coat of mail, or lastly, 

 only mucus. All these organs were only constructed 

 after the type of individual vegetable systems, in greatest 

 part only after the respiratory organ, and were therefore 

 partial in aspect or deficient. 



The highest covering must also bear the highest 

 meaning. This is that, which grows out of the sangui- 

 nary system collectively, out of the capillary vessels. 

 The capillary vessels of the covering are, however, the 

 hairs. The hair is the most perfect covering of the 

 animal. 



3445. These animals are the Thricozoa. 



Already the highest birds, e. g. the Ostrich and Casso- 

 wary, exhibit feathers which merge over into hairs. 



