VI 
EVOLUTION IN BIOLOGY 
[1878] 
y the former half of the eighteenth century, the 
3 “evolution” was introduced into biological 
tings , in order to denote the mode in which 
2 of the most eminent physiologists of that time 
ce cived that the generations of living things took 
; In opposition to the hypothesis advocated, 
: ‘the preceding century, by Harvey in that re- 
arkable work } which would give him a-claim to 
mk among the founders of biological science, even 
id he not been the discoverer of the circulation 
| of the blood. 
One of Harvey's prime objects is to defend and 
tablish, on the basis of direct observation, the 
inion already held by Aristotle ; that, in the 
higher animals at any rate, the formation of the 
1 The Exercitationes de Generatione Animalium, which Dr. 
‘ge Ent extracted from him and published in 1651. 
