Fig. A is a view of the stomach from below (or, in other words, from the side farthest from the backbone), in which it is seen that the clusters of water-cells (_a_ and _b_) are arranged, one (_a_) the larger, along part of the right border of the viscus, whilst the second (_b_) is transverse, the remainder of the walls being smooth. These water-cells, seen from within in Fig. B, are formed by the development of septa, both transverse and longitudinal, in the substance of the paunch-wall. They are deep and narrow, much like the cells of a honeycomb, and have a muscular membrane covering their mouths, in which there is an oval orifice opposite to each compartment capable of being further dilated or completely closed, probably at the will of the animal. When fully distended, these paunch-cells in the Arabian Camel are capable of storing a gallon and a half of water. The second stomach, or reticulum, is also modified in the same direction, the usually extremely shallow cells being deep, at the same time that food is never found in them after death. Of the last compartment, or “abomasum,” it may be noted that it is nearly cylindrical in shape, its walls being very muscular. It is in this stomach that true digestion is carried on. Of the Camels two species are known, differing in the number of the humps upon their backs. Nothing is known of either variety in the wild state. We will commence with the description of THE (TRUE) CAMEL.[45] The One-humped Camel of Arabia is frequently termed the Dromedary, but this latter name is correctly applicable only to the swift variety of the species which is employed for riding, the heavier-built One-humped Pack-Camel not being included under the designation. [Illustration: HEAD OF THE (TRUE) CAMEL.] It is the Arabian Camel--the _Ship of the Desert_--which is much more serviceable to man than its Bactrian ally. Its distribution has extended westwards along North Africa, from which attempts have been made to introduce it into Spain. Eastwards it is found as far as India. In the Camel the limbs and neck are lengthy. A single bulky hump is present on the middle of the back, composed of fatty cells held together by strong bands of fibrous tissue which cross in all directions. Like all similar accumulations, it varies much in size according to the condition of the animal, dwindling almost to nothing after protracted hard work and bad feeding, being firm and full in times of ease and plenty. When on the point of commencing a long journey, there is nothing on which an Arab lays so much stress as on the condition of his Camel’s hump, which, from what we have just said, must be considered to be nothing more or less than a reserved store of food.