CHIMPANZEES. 
33 
colours has been so uniformly negative, that I am disposed to think the animal must 
be colour-blind. The method adopted in these experiments was to obtain a number of 
brightly and uniformly coloured pieces of straw—each piece being either white, 
black, red, green, or blue. Offered the straws two by two of different colours on 
each occasion, the ape was invited to select the straw of the colour named from the 
one whose colour was not named, and, of course, on choosing correctly was rewarded 
with a piece of fruit. In this way she quickly learned to distinguish between the 
white straws and the straws of any other colour; but she never could be taught to 
go further. Now the distinction between the white straws and the straws of any 
other colour is a distinction which can be drawn by an eye that is colour-blind; 
and from the fact that the ape is always able to perceive this distinction, while she 
cannot be taught to distinguish any of the others, I conclude that her failure in this 
respect is not due to any want of intelligence, but to some deficiency in her powers 
of colour-perception.” 
We must conclude our notice of chimpanzees by the mention of 
Mafuka. A ^ 
a very remarkable ape which was brought from the Loango Coast in 
1875, and exhibited in the Zoological Gardens at Dresden. This animal was a 
female, and from its peculiar physiognomy, as shown in our two figures of its head, 
has given rise to much discussion as to what species it really belonged. The 
VOL. i. 
