HAIES, FEATHERS, AND SCALES. 



certain angles witli the eye of the beholder. Tlie 

 fibrous portion is here almost displaced by the 

 great development of the medullary cells. 



lu the larger hairs of the Mole, which we 

 will now look at, the bark is very thin ; and 

 though the sm-face is marked with sinuous 

 lines, these do not project into teeth. The 

 pith here again forms the greater portion of 

 the hair, the cells of which it is composed 

 being placed in single sei'ies, which, for the 

 most part, extend all across the body of the 

 hair, though they are somewhat irregular 

 both in size and shape. They are rather flat- 

 tened, and appear perfectly black (that is 

 opaque) by transmitted light, their surfaces 

 absorbing all the rays of light. The small HAin op cat. 

 hairs of the same animal, however, are very different in 

 form : they are flattened, so as to appear twice as broad 

 in one aspect as in another at / " 

 right angles to it ; and, what is 

 curious, the scales of the bark 

 project into strongly-marked im- 

 brications on one side, and are 

 scarcely perceptible on the \ -fi^ 

 other. Here, as in the larger U" 

 hairs, there is a single row of | * 

 oval transverse cells, perfectly ' i * 



* .. I 



l"!", 



opaque. ' ^^ 



The hair of many of thej 

 smaller Mammalia shows con- 

 siderable diversity of form, ac- 

 cording to the part which we select for observation. 

 Thus, if we take a long hair out of this Sable tippet. 



DAIKS or MOLE. 



