40 



THE GENESIS OF SPECIES. 



[CHAP. 



nothing to do with heredity, 1 it is unwarrantable to 

 make use of that explanation for other protective resem- 

 blances, seeing that its inapplicability, in certain instances, 

 is so manifest. 



Again, at the other end of the process it is as difficult 

 to account for the last touches of perfection in the mimicry. 



THE WALKING-LEAF INSECT. 



Some insects which imitate leaves extend the imitation 

 even to the very injuries on those leaves made by the 

 attacks of insects or of fungi. Thus, speaking of one of 

 the walking-stick insects, Mr. Wallace says : 2 " One of 



1 Heredity is tlie term used to denote the tendency which there is in 

 offspring to reproduce parental features. 



2 Loc. cit. p. 64. 



