CLASS MAMMALIA. 219 



becoming full, allows the overplus to reach a series of 

 cells along the upper part of the first stomach. The 

 contents of these latter is drawn on to supply the moist- 

 ure necessary for digestion. 



The family is tabulated as follows : 



TOES UNITED TO j One hump. CamS'lus drome da' ri us. Drom'edary. 



THE NAIL. I Two humps. Came'lus bactria'nus. Bactrian Camel. 



TOES SEPARATED. Without hump. AuchZ'riia tta'ma. LHi'ina. 



The Dromedary is peculiarly adapted to sterile regions. 

 Its long neck, incisors and canines in both jaws, prehen- 

 sile, cleft upper lip, and narrow cheek-bones, enable it to 

 crop its food of thorny bushes by the wayside without 



FIG. 381. 



Came'lus dram e da' r'ms. Dromedary. 





retarding its speed ; its hairy nostrils, which close intui- 

 tively, protect it from inhaling the particles driven by 

 the simoom ; its broad, cushioned foot prevents its sink- 

 ing in the sand ; its many-celled stomach enables it to 

 go three or four days without suffering from thirst, and 

 the gradual absorption of its fatty hump a still longer 

 time without food ; its callosities on the breast and joints 

 permit its kneeling on the hard sand without abrading 

 the skin ; its projecting eye, sheltered from the sun by 



