WONDERS OF THE MICROSCOPE 259 



of how the base or bulb of the hair is embedded 

 in the skin and passes out to the surface through 

 a kind of little sheath. The human skin when 



Fig. 179. A section cut through the skin of a mouse to 

 snow how the hairs originate from bulbs below the 

 surface skin 



seen in section shows similar hair develop- 

 ment. 



The colour of the hair is derived from pigment 

 granules contained in a layer of cells between the 

 outer cuticle layer and the true skin. These 

 granules are very minute and appear abundantly 

 in healthy hair, and are mostly arranged in lines 

 between the elongated and elastic cells of the 

 cortex or exterior of the hair. 



