There appear to be three centers of gorilla population. The first is in the basin of Izanga Lake; the second is on the south side of the basin of Lake Nkami; and the third is in the basin of the lake east of Sette Kama and west of the Nkami River. The gorilla is rarely, if ever, found in high or hilly districts. He appears to be restricted to the hummock lands, which are elevated only a few feet above tide-level. This is all the more singular from the fact that the ape appears to have a morbid dislike for water, and it is doubtful whether or not he can swim. It is true that he has one peculiar characteristic that belongs to aquatic animals. He has a kind of web between the digits; but its purpose cannot be to aid in swimming. I have been told that the gorilla can swim, and the statement may be true; but I have never observed anything in his habits to confirm this, and I have noted many facts that controvert it. I know of no valid reason why he should be confined to the limits mentioned, unless it be on account of climatic conditions which are peculiar to this district. South of it the climate along the coast is much cooler. The country east of it is hilly and comparatively barren. North of the equator is a land of almost perpetual rain. Within this district dry and rainy seasons are more equally divided and more uniform in temperature. The gorilla appears to be an indigenous product which does not bear transplanting. He thrives only in a low, hot, and humid region, infested by malaria, miasma, and fevers. It is doubtful if he can long survive in a pure atmosphere. The only specimen that I have ever heard of north of the equator was one on the south side of the Komo River, which is the north branch of the Gaboon. The point at which I heard of his being was within a few miles of the equator. I also heard of five having been seen a few miles southwest from Njole, which is located on the equator on the north bank of the Ogowé, a little way east of the Nguni. They were said to be the first and only ones ever seen in that region within the memory of man. As to their being found between Gaboon and Cameroon, I find no trace along the coast of one ever having been seen in that part.