202 THE ANATOMY OF SCIENCE 



of chemistry ? Why should not the efficient auto- 

 mobile of to-day be replaced by the horseless 

 carriage of to-morrow? Among the animals too 

 it would be a grave mistake to ignore the mental 

 traits. Darwin, while advancing the theory of 

 natural selection, also pointed out the great 

 importance of sexual selection; but that must 

 certainly be regarded as a mental selection by 

 everyone except the most extreme psychophobe. 



If, however, we say that a living individual 

 has both body and mind, and that each has a 

 profound influence upon the other, we must be 

 careful not to say more than we mean. Indeed, 

 I may remark parenthetically that it is not 

 always easy to recognize the individual^ itself, 

 to say nothing of the individual's body and 

 mind. 



Ordinarily, however, there is no ambiguity 

 when we speak of an individual, but can we so 

 easily segregate the body from the mind.'^ We 



2 Maeterlinck, in his beautiful book, The Life of the Bee, 

 speaks of the spirit of the hive, and although scientists 

 might not be willing to go quite so far as this at present, it 

 may not always be easy to tell when a colony of individuals 

 is itself to be regarded as an individual. Professor G. H. 

 Parker is making some extremely interesting studies of a 

 type of colony which to certain stimuli behaves like a single 

 creature, to others like an assemblage of mutually inde- 

 pendent members. 



