HAIRS, SECTIONS OF. 



673 



portion ; the latter does not usually exist in the whole 

 length of the shaft. The cortical part consists of fibres, 



Fig. 306. 



1, Transverse section of human hair, showing the internal of medullary sub- 

 stance. 2 Longitudinal section, snowing the fibrous character of the same 

 pigment or colouring matter, and serrated edges. 



arranged parallel to each other: besides these there are, 

 on the exterior, minute epithelial scales, which are ar- 

 ranged like the tiles on a house, producing the appearance 

 of transverse markings. The fibres gradually expand out, 



Fig. 307. 



Hair from the Indian Bat, magnified 500 diameters. 2, Hair supposed to 

 belong to (Dei mestes?) Anihrenus, magnified 250 diameters. 3, Hair from the 

 Mouse, magnified 250 diameters. 



X X 



