148 



Experimental Zoology 



For example, a female of a race with black worms and white 

 cocoons was mated to a male with striped worms and yellow co- 

 coons. The offspring were : — 



The mother had been a white moth, the father a black 

 moth. The offspring (of this table) consisted of a small number 

 of whites, and the majority of a "gris-marron ou moues fonce," 

 in other words, a melange het6rogene of the white and the 

 black character, but without predominance of either. 



"The fact of greatest interest in this cross is the fusion, or at 

 least the close juxtaposition, of the black and the striped charac- 

 ters in half of the caterpillars of this lot. These worms at the 

 same time black and striped are most curious and constitute a 

 new character without any intermediate." 



The further evolution of these new types was as follows: 

 The group with black-and-striped worms and yellow cocoons 

 gave: — 



The group with black-and-striped worms and white moths 

 gave: — 



