The Malay sun bears are hysterical, aggressive and evil-tempered. The Japanese black bears are nervous, cowardly and aggressive. To those who form and maintain large collections of bears, involving much companionship in dens, it is necessary to keep a watchful eye on the temperament chart. THE DEER. In our Zoological Park establishment there is no collection in which both the collective and the individual equation is more troublesome than the deer family. In their management, as with apes, monkeys and bears, it is necessary to take into account the temperament not only of the species, but also of each animal; and there are times when this necessity bears hard upon human nerves. The proneness of captive deer to maim and to kill themselves and each other calls for the utmost vigilance, and for heroic endurance on the part of the deer keeper. Even when a deer species has a fairly good record for common sense, an individual may "go crazy" the instant a slightly new situation arises. We have seen barasingha deer penned up between shock-absorbing bales of hay seriously try to jump straight up through a roof skylight nine feet from the floor. We have seen park-bred axis deer break their own necks against wire fences, with 100 per cent of stupidity. CHARACTERS OF DEER SPECIES The white-tailed deer is sanguine, but in the fall the bucks are very aggressive and dangerous, and to be carefully avoided. The mule deer is sanguine, reasonable and not particularly dangerous. The elk is steady of nerve, and sanguine in temperament, but in the rutting season the herd-masters are dangerous. The fallow deer species has been toned down by a hundred generations of park life, and it is very quiet, save when it is to be captured and crated. The axis deer is nervous, flighty, and difficult to handle. The barasingha deer is hysterical and unaccountable. The Indian and Malay sambar deer are lymphatic, confident, tractable and easily handled. Never keep a deer as a "pet" any longer than is necessary to place it in a good home. All "pet deer" are dangerous, and should be confined all the time. Never go into the range or corral of a deer herd unless accompanied by the deer-keeper; and in the rutting season do not go in at all.