No. 635] THE HAIR OF MAMMALS 501 



cells, or hair spindles, except under dissociative treat- 

 ment with caustic soda, caustic potash, or acids of vari- 

 ous sorts, and hence is of very little value as a criterion 

 for determining the species of the hair. 



The coloring matter, or pigment, of the hair shaft is 

 either distributed diffusely and homogeneously through- 

 out the cortex, or exists as an aggregation of granules 

 between or within the fusiform cortical cells, or hair 

 tween or within the fusiform cortical cells, or hair 

 spindles. Where the latter is the case the granules ap- 

 pear to be of definite form and mode of placentation for 

 each species of hair. In many cases, it is believed that 

 the characteristic patterns formed by the arrangement 

 of the pigment granules, as well as the form of the gran- 

 ules themselves may offer a valuable character for iden- 

 tification. Figs. 190, 191, and 192 show respectively por- 

 tions of the hair shafts of the mandril (Cyanocephalus 

 maimon), badger (Taxidea americana), and wolverene 

 (Gulo luscus), very highly magnified, illustrative of the 

 differences which may exist in the configuration and ar- 



