28 
PROOFS OF EVOLUTION. 
which led to the line of man, and these are not 
hard to imagine with the factors of evolution in 
view, and highly favoring conditions superadded. 
Let it be remembered that a rugged environ¬ 
ment necessitating marked changes through the 
use or disuse of organs, together with the ever- 
continuing struggle for existence, perpetuating 
the strongest and best under the law of heredity, 
are the great forces in Morphological develop¬ 
ment. 
Once more, let us go back to the common 
ancestors of Man and the Anthropoid, and watch 
these primitive children as they start out together, 
some in one direction, some in another, their 
dispersion extending over broad territories during 
thousands of years, until at last they find them¬ 
selves in utterly dissimilar environments ; the one 
condition unfavorable, the other highly favorable 
to progressive development. Let us suppose the 
favored ones found themselves in the midst of 
circumstances not requiring tree-climbing, either 
for food or for safety. Naturally, they would 
begin to use their fore-paws for food-gathering, 
and for throwing missiles at enemies. This habit 
would gradually throw the weight of the body 
