GENERAL SUMMARY. 169 



to explain only the method in which evolu- 

 tion progressed. 



Of the mystery of evolution of the pur- 

 pose of the higher or lower specialisation 

 of successive types, or the means by which 

 their differentiation was effected we know 

 and can know nothing, any more than we 

 can fathom the mystery of life or of its 

 origin. 



->;."';( t ,*',,,. 

 : ' *>>4^v.; v 

 *-> 



