Psychophysical Parallelism in Evolution 19 



The action of natural selection, I may add for complete- 

 ness, secures the survival of the insects so coloured, seeing 

 that being warned, their enemies let them alone. The 

 possibihty of the evolution of the definite coloration turns, 

 in fact, upon this series of psychological processes.^ 



1 On this particular topic see Professor Poulton's Colotirs of Animals. A 

 recent concise statement of the facts by the same writer is to be found in the 

 Did. of Philos. and Psychol., arts. 'Warning Colours,' and 'Mimicry.' 



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