In his distribution, he is confined to Equatorial Africa. His habitat, roughly outlined, is from the fourth parallel north of the equator to the fifth parallel south of it, along the west coast, and extends eastward about half-way across the continent. His range can be defined with more precision, but its exact limits are not quite certain. Its boundary on the north is defined by the Kameroon valley, slightly curving to the north, but its extent eastward is not well known. He does not appear to be found anywhere north of this river, and it is quite certain that the few specimens attributed to the north coast of the Gulf of Guinea do not belong to that territory. On the south, its boundary starts from the coast, at a point near the fifth parallel, curves northward, crossing the Congo near Stanley Pool, pursues a north-east course, to the centre of the Congo State, again curves southward, across the Upper Congo, towards the north end of Lake Tanganyika. Its limits appear to conform more to isothermal lines, than to the rigid lines of geometry. Specimens are sometimes secured by collectors beyond the limits mentioned, but so far as I can ascertain they appear to have been captured within these limits. There are numerous centres of population. This ape is not strictly confined to any definite topography, but occupies the upland forests or the low basin lands. In one section he is known to the natives by one name, and in another by quite a different one. The name _chimpanzee_ is of native origin. In the Fiot tongue the name of the ape is _chimpan_, which is a slight corruption of the true name. It is properly a compound word, the first syllable is from the Fiot word _tyi_, which white men erroneously pronounce like "chee." It means "small," and is found in many of the native compounds. The latter syllable is from _mpâ_, a bushman, hence the word literally means, in the Fiot tongue, "a small bushman." Among other tribes the common name of the ape is _ntyigo_. The two names appear to come from the same ultimate source. The latter is derived from the Mpongwe word _ntyia_, blood, hence breed, and the word _iga_, the forest, and literally means the "breed of the forest." The same idea is involved in the two names, and both convey the oblique idea that the animal is something more like man than other animals are.