26o MINUTE MARVELS OF NATURE 



The hairs of the mouse and other rodents 

 exhibit beautiful and interesting examples of hair 

 structure on account of the arrangement of their 

 air-cells. The mouse hair, Fig. i8o, shows an 



Fi'ct. loo. Mouse hair 



arrangement in the larger hairs of three longitu- 

 Liinal series of cells, while the finer hairs have but 

 one or two rows of cells. 



Human hairs do not present such pretty exam- 

 ples as some of those of the lower animals. A 

 few shavings from the human beard are shown at 

 Fig. i8i. Ihese it will be obser\'ecl present a 

 ■dark appearance along their centres, and this is 



