. Principles of economic zoo?logy. Zoology, Economic. 338 BRANCH CHORDATA which the large nostrils may be closed against the simoons of the desert; and by their prominent eyes and heavy, overhanging eyelids. The hump is IX real and acknowledged reservoir of nutriment stored up during moist seasons, as well as nature's pack saddle for the commerce of the ages.' For centuries the camel has been the means of transportation over the desert. Papyrus records show it was well known in Egypt at least thirty-two centuries ago. Yet in all these centuries "little of sympathetic association has been
. Principles of economic zoo?logy. Zoology, Economic. 338 BRANCH CHORDATA which the large nostrils may be closed against the simoons of the desert; and by their prominent eyes and heavy, overhanging eyelids. The hump is IX real and acknowledged reservoir of nutriment stored up during moist seasons, as well as nature's pack saddle for the commerce of the ages.' For centuries the camel has been the means of transportation over the desert. Papyrus records show it was well known in Egypt at least thirty-two centuries ago. Yet in all these centuries "little of sympathetic association has been gained between beast and ; Owing to its viciousness and stupidity it has been subjugated rather than domesticated. However, it has been developed into many serviceable forms, some swift and elegant, others strong and ugly. There are two distinct species of camels, the Bactrian or two-humped camel {Came'lus hnclrititius) and the one-humped (C. dromedarius) (Fig. 275). The two species will interbreed it is said, and it is not probable that either is now found in a genuinely wild state. The camel is a thickly built, ungainly pack horse. The dromedary is the finer-haired, light-step-. Fig. 274.—a, Water-cells in the paunch of the camel; h, foot, showing the pad. (From Holder's " Elements of Zoology," American Book Co., Publishers.) ping race horse. The former travels three miles in an hour and six hours in a day, while the latter can run seventy miles a tlay. The latter is several times the value of the former. The single calf is weaned when about a year old, but it is not fitted for service until fi\'e years old. We are accustomed to think of camels as associated with heated countries alone, but the Bactrian camel can endure much cold, and carry on the overland trade between China and Russia across the plains of Mongolia or Turkestan amid the snows of winter and the dust of summer. E\"ery spring the camel loses every frag- ment of its hair and
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