In the first place, it has great spreading feet. Now this is very important, for if the animal had small, hard hoofs, like those of the horse or the donkey, it would sink deeply into the loose sand at every step, and would soon be so tired out that it would be quite unable to travel any farther. But its broad, splay, cushion-like toes do not sink into the sand at all, and it can march easily along, hour after hour, where a horse could scarcely travel a mile. Then it can go for several weeks with hardly any food. All that it finds as it journeys through the desert is a mouthful or two of dry thorns, and even at the end of the day its master has nothing to give it but a few dates. And on this meager diet it has to travel forty or fifty miles a day with a heavy load on its back. But then, you must remember, the camel has a hump. Now this hump consists almost entirely of fat, and as the animal marches on day after day with scarcely any food, this fat passes back by degrees into its system, and actually serves as nourishment. So, you see, while the camel is traveling through the desert it really lives chiefly on its own hump! By the time that it reaches its journey's end, the hump has almost entirely disappeared. Little more is left in its place than a loose bag of empty skin. The animal is then unfit for work and has to be allowed to graze for two or three weeks in a rich pasture. Then, day by day, the hump fills out again, and when it is firm and solid once more the camel is fit for another journey. More wonderful still, perhaps, is its way of carrying enough water about with it to last for several days. Except the camel, typical ruminating animals, or those which chew the cud, have the stomach divided into four separate compartments, through which the food passes in turn. These are called the paunch, the honeycomb stomach or bag, the manyplies and the abomasum. In the camel the third of these is wanting, and the first and second are provided with a number of deep cells, which can be opened or closed at the will of the animal. In these cells the animal is able to store up water. When it has the opportunity of drinking, it not only quenches its thirst, but fills up all these cells as well. In this way it can store up quite a gallon and a half of liquid. Then, when it grows thirsty, and cannot find a pool or a stream, all that it has to do is to open one or two of the cells and allow the contents to flow out, and so on from time to time until the whole supply is exhausted. In this way a camel can easily go for five or six days without requiring to drink, even when marching under the burning sun of the desert. Two kinds of camels are known, neither of which is now found in a wild state. ARABIAN CAMEL