HAIRS, FEA'riTKRS, AND SCALES. 



certain angles M-itli tlie eye of tlie beholder, 

 fibrous \3ortion is here almost displaced by the 

 great development of the medullary cells. 



In the larger hairs of the Mole, ■which vre 

 Avill now look at, tlic bark is very thin ; and 

 though the surface is marked Avith sinuous 

 lines, these do not project into teetli. The 

 pith here again forms the greater portion of 

 the hair, the cells of which it is composed 

 being placed in single series, which, for the 

 most pjirt, extend all across the body of tlie 

 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 haik of 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 arc 

 scarcely perceptible on the 

 other. Here, as in the larger 

 liairs, there is a single row ut ', 

 oval transverse cells, perfectly 

 opaque. 



The hair of many of the ^ 

 smaller Mammalia shows con- 

 siderable diversity of form, ac- 

 cording to tlie part which we select for observation. 

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



^■'r*c>'«^i.i''' 



HAIRS OF MOLE. 



