178 MOSTLY MAMMALS 
all their energies to the solution of problems of this nature 
(and their name is legion) before it becomes for ever too 
late. 
After what has been said as to the necessity of actual 
observation to determine the reason for the peculiar nasal 
development of these monkeys, it would obviously be out 
of place to attempt to solve the problem in any other way. 
Attention may, however, be directed to the circumstance 
that the chiru, or Tibetan antelope, has a remarkably 
swollen and puffy nose. And although the saiga antelope, 
of the plains of Central Russia, has an equaily remarkable 
nasal development, yet it seems highly probable that in 
the case of the chiru, at any rate, the enlarged size of the 
nasal chamber and nostrils is correlated with the rarefied 
atmosphere of the elevated plateau on which that ruminant 
dwells. The snub-nosed monkeys, although living at a 
considerably lower elevation than the chiru, are yet “ well 
up in the world”; and since the shape of the nose in the 
former would appear designed to admit the passage of as 
much air as possible with the least impediment, it may 
perhaps be suggested that the habitat has something to do 
with the nose structure. As to the reason for the genesis 
of the ungainly proboscis of the Bornean monkey, I have 
not even the rudiment of a theory to offer my readers. 
