The descent, as we have elsewhere observed, from the highest ape to the lowest monkey presents one unbroken scale of imbricating planes; and we have seen in what degree man is related to the higher ape. From whence we may discern in what degree his physical nature is the same as that of all the order to which he belongs. No matter in what respect he may differ in his mental and moral nature, his likeness to them should at least restrain his pride, evoke his sympathy, and share the bounty of his benevolence. Let man realise to its full extent that he is one in nature with the rest, and they will receive the benign influence of his dignity without impairing it, while he will elevate himself by having given it. CHAPTER XVIII THE TREATMENT OF APES IN CAPTIVITY In conclusion, I deem it in order to offer a few remarks with regard to the causes of death among these apes, and to the proper treatment of the animals in captivity. We know so little and assume so much concerning them that we often violate the very laws under which they live. We have already noticed the fact that the gorilla is confined by nature to a low, humid region, reeking with miasma and the effluvia of decaying vegetation. The atmosphere in which he thrives is one in which human life can hardly exist. We know in part why man cannot live in such an atmosphere and under such conditions, but we cannot say with certainty why the ape does do so. It would seem that the very element that is fatal to the life of man gives strength and vitality to the gorilla. We know that all forms of animal life are not affected in the same way by the same things, and while it may be said in round numbers that whatever is good for man is good for apes also, it is not a fact. The human race is the most widely distributed of any genus of mammals and, as a race, can undergo the greatest extremes of change in climate, food and other conditions of any other animal. His migratory habits, both inherent and acquired, have fitted him for a life of vicissitudes, and such a life inures him as an individual to all extremes. On the other hand, the gorilla, as a genus, is confined to a small habitat, which is uniform in climate, products and topography; and having been so long restricted to these conditions he is unfitted for like changes, and when such are forced upon him the result must always be to his injury.