TIME AND CHANGE 
do not see is active in the ground underfoot and in 
the forms of life about us which is the final secret of 
the origin of man and of all other creatures. This 
something is the evolutionary impulse, this innate 
aspiration of living matter to reach higher and 
higher forms. “Urge and urge,” says Whitman, 
“always the procreant urge of the world.” It is in 
Emerson’s worm “striving to be man.”’ This “striv- 
ing” pervades organic nature. Whence its origin 
science does not assume to say.! 
Then the difference in kind between the mind of 
man and that of the lower orders makes evolution 
a doubly hard problem. 
Look over the globe and see what a gulf separates 
man from all other creatures. All the other animals 
seem akin — as if the product of the same workman. 
Man, in contrast, seems like an introduction from 
some other sphere or the outcome of quite other 
psychological laws; his dominion over them all is 
so complete and universal. Without their special- 
ization of structure or powers, he yet masters them 
all and uses them; without their powers of speed, 
he yet outstrips them; without their strength of 
tusk and limb, he yet subdues them; without their 
inerrant instinct, he yet outwits them; without their 
keenness of eye, ear, and nose, he yet wins in the 
1 This passage was written long before I had read Bergson’s 
Creative Evolution, as were several others of the same import in 
this volume. 
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