It appears likely that the two domesticated equine species have been under the care of man for about the same length of time; but the difference in their condition, and in the place which they hold in civilization, is very great. As we have seen, the horse has been made to vary in a singular measure, its form and other qualities changing to meet the need or fancy of its master. Its humbler kinsman has remained almost unchanged. Except small differences in size, the donkeys in different parts of the world are singularly alike. In part this lack of change may be explained by the relative neglect with which this species has been treated. From the point of view of the breeder it has perhaps been the least cared for of any of our completely domesticated animals. In some parts of the world, as for instance in Spain, where a long-continued effort has been made to develop the animal for interbreeding with the horse, the result shows that the form is relatively inelastic. It is doubtful if any conceivable amount of care would develop such variations as the horse now exhibits. The principal hinderances to the general acceptation of the donkey as a help-meet to man are found in its small size and slow motion. These qualities make the creature unserviceable in active war or in agriculture, and they seem to be so fixed in the blood that they are not to any extent corrigible. So long as pack animals were in general use, and in those parts of the world where the conditions of culture cause this method of transportation to be retained, the qualities of the donkey have proved and are still found of value. The animal can carry a relatively heavy burden, being in such tasks, for its weight, more efficient than the horse. It is less liable to stampedes. It learns a round of duty much more effectively than that creature, and can subsist by browsing on coarse herbage, where a horse would be so far weakened as to become useless. Thus, in developing the mines in the unimproved wilderness of the Cordilleras, where ores of the precious metals have to be carried for considerable distances, trains of "burros" are often employed. The animals quickly learn the nature of their task, and will do their work with but little guidance from man. In general we may say that the donkeys belong to a vanishing state of human culture, to the time before carriage-ways existed. Now that civilization goes on wheels, they seem likely to have an ever-decreasing value. A century ago they were almost everywhere in common use. At the present time there are probably millions of people in the United States to whom the animal is known only by description. In a word, the creature marks a stage in the development of our industries which is passing away as rapidly as that in which the spinning-wheel and the hand-loom played a part.