592 The American Naturalist. [July, 
apparently meaningless results obtained by one or the other of 
the experimenters, while preventing an immediate incorpora- 
tion of the facts of experimental physiology with those 
recorded by the purely observational school should not blind 
us to the importance of the work thus far done, both as a good 
beginning in a promising field and as already furnishing val- 
uable controls for the guidance of speculations upon some of 
the most fundamental questions in biology. 
“Toutes les expériences, toutes les mutilations qui én fait 
subir à un oeuf normal, contribuent, en effet, à devoiler sa 
structure, et cest certainement là une des plus belles recher- 
ches que le naturaliste puisse se proposer.” 
