46 STRUCTURAL AND SYSTEMATIC ZOOLOGY 



of the head, the position and structure of ears, eyes, nos- 

 trils, and mouth. 



Remove the skin from the body and study the position 

 and attachment of the more important muscles, their uses. 

 Open the body and examine the organs composing the 

 digestive, circulatory, respiratory (Fig. 283), excretory, 

 and reproductive systems (Fig. 250). Note the posi- 

 tion and structure of the teeth and their fitness to mas- 

 ticate the special kind of food the animal eats ; the 

 surface of the tongue and its adaptation as an organ 

 for cleaning the fur; compare the heart and brain 

 (Fig. 339), and the microscopic appearance of the blood 

 corpuscles with those of other vertebrates examined 

 (Fig. 259). 



Trace the course of some of the principal blood vessels 

 and nerves. 



Examine a skeleton and compare with that of the 

 other vertebrates studied (Fig. 303). 



A series of preparations of fetal kittens or rabbits may 

 be examined. 



