SETON^ — EVOLUTIONARY FORCE OF A WIDE RANGE 
169 
Australia, no species of Madagascan evolution, has ever established 
itself in Africa. 
My sad contention, then, to my Russian friends, was that the Ameri- 
can wild turkey would stand no chance of success if introduced into a 
Eurasian environment, to compete with the highly equipped native 
species. 
As apparent exceptions one recalls the canal weed, {Philotria cana- 
densis), an American species running riot in England; the water hya- 
cinth of South America becoming a nuisance in Florida; maybe also 
the muskrat which is said to be possessing parts of Europe. 
I suppose that the answer is that the rival species these invaders 
must combat in their new homes, were evolved in small, isolated sections 
of their larger motherland, in some way hedged about by an impassable 
barrier. They had not really a continent-wide dispersal, so were not 
subject to the urge of a wide environment, and, therefore, are not 
exceptions to the principle of the law. 
The great land centre of evolution is Eurasia, and it will continue 
to turn out the successful species, as long as it continues to be the great- 
est unbroken land area, a thought that is not without its measure of 
warning to the human species, when one recalls that, in a rigid applica- 
tion of this law, the Oriental races are bound to inherit the earth. 
Greenwich, Connecticut, 
