Questions Evolution Does Not Answer 
appreciably increased since the 
middle of the Tertiary period. Such 
an increase would naturally have 
occurred according to the theory 
of constant production of new 
species. 
The assertion is made, however, 
that in a few instances we do have 
fossil evidence of the development 
of higher types from lower through 
gradual modification, and the an¬ 
cestry of the horse is cited as a case 
in point. We are told that “the 
horse tribe, commencing with an 
early four-toed ancestor in the 
Eocene age, has increased in size 
and in perfect adaptation of feet 
and teeth to a life on open plains, 
and has reached its highest perfec¬ 
tion in the horse, the ass, and the 
zebra.’* (Wallace, 4 6 Darwinism,*'* 
p. 120.) There are three things 
worthy of notice in this supposed 
evolution of the horse: First, that, 
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