Both of these apes are possessed, in a degree, of savage and resentful instincts; but these are much stronger in the gorilla than in the chimpanzee. The gorilla, therefore, requires firm and consistent treatment. This can be used without severity or cruelty, but the intellect of the gorilla must not be underrated. He studies with a keen perception the motives and intentions of man, and is seldom mistaken in his interpretation of them. He often manifests a violent dislike for certain persons, and when this is discovered to be the case, the object of his dislike should not be permitted in his presence, for the result is to enrage the ape and excite his nervous nature. When he becomes sullen or obstinate, he should not be coaxed or indulged, nor yet used with harshness. He should either be left alone for a time or be diverted by a change of treatment. INDEX “Aaron” his intelligent expression, 144, 146, 147 his capture, 145 on the journey, 147, 148 his tricks, 148 ” one aversion, 148, 149 ” sympathy for Moses, 149-152 realization of death, 151, 152 loses his mate, 170 his illness and death, 172-174 “Aaron” with “Elisheba” acts as a protector, 156 his reliance on human aid, 157, 158-159 driving the cow, 158, 159 we start for Liverpool, 159 the bogie on the steamer, 159 solicitude of the apes, 159-160 their ingenuity, 161 the ape in the mirror, 161-162 Aaron’s jealousy, 162-165 the rivals, 163-165 arrival at Liverpool, 167, 168 Elisheba’s illness, 168 Aaron again becomes nurse, 170 Abstract ideas in simians, Lack of, 20, 36 Affection in animals not mere instinct, 58-59, 173 Age of maturity in apes, 98, 191, 192 Amusement (of captives) captives should have, 55-56, 283 means of, 20-21, 33, 35, 54-56 _Angola_, 268 Anthropoid or manlike apes (see also _Chimpanzee_, _Gorilla_, _Gibbon_, _Orang_, and references under _Chimpanzee captives_) the group, 3 superior intelligence, 35, 60 Apes (see also _Simians_ and references under _Anthropoid apes_) resemblance to man, 2 described, 3, 92-98, 223 ff. anthropoid or manlike group, 3 skeleton a duplicate of man’s, 4, 7 superior intelligence of anthropoid, 35, 60 travelers’ stories untrue, 71-72, 235-236, 266 ff. do not act in concert, 268 Approval, Apes’ love of, 197, 203 Arboreal habit, The, 96-97, 224-225, 245 Baboon, The, 3, 14, 15, 196-197, 224, 266, 277 relative plane, 3, 277 Bailey, Mr. James A., New York City his valuable apes, 190-191 corroborative testimony, 268 “Banquo,” 28-29 Battel, Henry (1590), 267, 268 _Batuna_ (plant), 77, 245 Bellevue Gardens, Manchester, England (see also _Consul II_) Consul II, 193 a pugnacious ape, 198-200 chimpanzee and orang, 200 Borneo, 274 Buffalo (N. Y.) Museum, Specimens in, 104