HAIRS, SECTIONS OF. 



673 



lary 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 cylinder of medullary sub- 

 stance. 2 Longitudinal section, showing 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, 



..-. 



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

 belong to (Deivustes?) Anthrenus, magnified 250 diameters. 3, Hair from th 

 Mouse, raagniticu 250 diameters. 



