BRAIN v. MUSCLE IN NATURE 
O observer of animals can fail to have 
noticed how they seem to lack brain-power. 
Judged by human standards, a bird or beast 
is but a stupid creature. If, however, we 
measure the other organs of animals by a similar 
standard, we shall not find them wanting. The adapta- 
tion of nearly every species to its environment compels 
our admiration. Some are wonderful athletes, others 
are possessed of marvellous strength, others exhibit 
incredible powers of endurance; in short, there is no 
physical characteristic in which some animal is not 
pre-eminent. There exist dozens of animals that are 
physically superior to man. But, notwithstanding this 
superiority, they are all his slaves, for mentally he is 
head and shoulders above them. Muscle is no match 
for mind. 
Why is it that, of all the millions of animals, only 
one species—Homo sapiens—has “gone in for” brain 
development on a large scale? 
Other things being equal, it is obvious that the animal 
with the largest brain has the best chance of survival in 
the struggle for existence. As compared with brain 
power all other qualities are of minor importance. If 
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