10 EVOLUTIOH 



principle of their research. Archaeologists were slowly 

 bringing to light the evolutionary story of prehistoric 

 man ; philologists were linking the languages of the world 

 in genealogical groups; religions, arts, and social institu- 

 tions were having the same broad light cast on them. 

 The idea of evolution is now one of the surest guiding 

 principles of the scientific investigator, and its application 

 has been traced with considerable success. What 

 modifications have been made of the earlier theories, as 

 our knowledge of nature increased, will appear in the 

 survey of the more interesting parts of the field on which 

 we are now in a position to enter. 



