ANIMAL PHYSIOLOGY. 



[LESSON 27. 



FIG. 135. 



FIG. 136. 



Transverse section of hair from the Ele- Hog's bristle, 



phant's proboscis. 



(a), in the cortical substance (6). Another section of a Hog's bristle 



(Fig. 137), made nearer to the lower 

 portion, shows greater density in the 

 outer part of the cortical substance, 

 but the several medullary canals in 

 its interior are fully apparent. 



They are, however, still better 

 shown in the hair of the Elephant's 

 tail, especially if the section be made 

 near to the bulb ; such an illustra- 

 tion (Fig. 138) is quite conclusive of 

 the fact stated. The medullary ca- 

 nals (a, a), contain cells, most of 



them provided with pigment, while the cortical substance (6), is re- 

 plete with pigment cells of the most perfect shape. 



Fu>> m 451. Much difference, 



too, exists in the form of 

 the hairs of the tail and 

 proboscis ; in the former 

 they nearly resemble that 

 of human hair ; the latter, 

 like the Hog's bristle, are 

 nearly round. 



Plurality of medullary 

 canals may be seen in an- 

 other tissue, which is to 



Transver.se section of hair from the Elephant's tail. a jj a pp earancc an y thing 



but hair-like in its general characteristics. 



