46 THE PROBLEM OF EVOLUTION 



with which I dealt at the beginning of this lecture. 

 As to the application to man of Darwin's theory of 

 selection, let it suffice to say that it is untenable 

 because it regards man too exclusively as an animal ; 

 but the application to man of the theory of evolu- 

 tion will be the subject of my third lecture on Sunday 

 next. 



I may sum up shortly the results of my examina- 

 tion into the scientific value of Darwinism in the 

 following way : 



Darwin's theory of selection is indispensable as a 

 subsidiary factor in the theory of evolution ; but 

 its value is subordinate and varies very greatly, 

 according to the class of phenomena with which we 

 are concerned. For instance, among the guests or 

 inquilines of the ants and termites we recognised 

 yesterday a hostile type, calculated to resist attacks ; 

 a mimetic type, in which the guests deceive their 

 host by their close resemblance to them ; and, lastly, 

 there is the type of true guests. The theory of 

 selection, when applied to these three types, has 

 quite different results. It is most important in the 

 case of the hostile type, somewhat less so in the 

 case of the mimetic type, and least of all in the third 

 or symphilic type, in which we find the principal 

 factor to be amicable selection, which is not only 

 different from natural selection, but, from a certain 

 stage of development onwards, is in antagonism to 

 it and prevails over it. 1 



i Cf. Modern Biology, pp. 338, 345, 384. 



