53 
important in giving volume to a voice which can be heard for 
half a league, the Gorilla, which has similar sacs, more 
largely developed, and whose bulk is fivefold that of a 
Gibbon, may well be audible for twice that distance. If 
the Orang fights with its hands, the Gibbons and Chim- 
-panzees with their teeth, the Gorilla may, probably enough, 
do either or both; nor is there anything to be said against 
either Chimpanzee or Gorilla building a nest, when it is 
proved that the Orang-Utan habitually performs that feat. 
With all this evidence, now ten to fifteen years old, before 
the world, it is not a little surprising that the assertions of a 
recent traveller, who, so far as the Gorilla is concerned, 
really does very little more than repeat, on his own authority, 
the statements of Savage and of Ford, should have met with 
so much and such bitter opposition. If subtraction be made 
of what was known before, the sum and substance of what 
M. Du Chaillu has affirmed as a matter of his own observation 
respecting the Gorilla, is, that, in advancing to the attack, the 
great brute beats his chest with his fists. I confess I see 
nothing very improbable, or very much worth disputing 
about, in this statement. 
With respect to the other man-like Apes of Africa, M. Du 
Chaillu tells us absolutely nothing, of his own knowledge, 
regarding the common Chimpanzee ; but he informs us of. a 
bald-headed species or variety, the nschiego mbouve, which 
builds itself a shelter, and of another rare kind with a 
comparatively small face, large facial angle, and peculiar 
note, resembling “ Kooloo.” 
As the Orang shelters itself with a rough coverlet of 
leaves, and the common Chimpanzee, according to that 
eminently trustworthy observer Dr. Savage, makes a sound 
like “Whoo-whoo,”—the grounds of the summary repudiation 
with which M. Du Chaillu’s statements on these matters 
have been met is not obvious. 
If I have abstained from quoting M. Du Chaillu’s work, 
then, it is not because I discern any inherent improbability 
