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MAMMALIA. 
We must not omit to mention the callosities which Camels have 
on their breast, knees, and insteps, as well as on their patella and 
heels. Their feet are bifurcated. The two toes on each foot are 
not enveloped in horn, and have only on the last joint a somewhat 
short and hooked nail. A hard and callous sole covers the bottom 
of the toes — a characteristic which enables them to walk with ease 
on loose sand, where the Elephant would he useless and the Horse 
soon exhaust its strength. 
Fig. 71. — Camel’s Head. 
The Camel is a native of ancient Bactria, now the country of 
the Usbecks. It principally lives in Asia, where it has been 
used, from antiquity, for domestic and military service. In Africa, 
where it is acclimatised, it has doubtless existed since the time of 
the conquest of that country by the Arabs. 
The Dromedary is distributed all over a great part of Northern 
Africa, and the major portion of Asia. It seems originally to 
have been a native of Arabia. 
After these considerations on the structure and places of habi- 
tation of the Camel, we will dwell a little on the immense service 
