2 9 o SCIENCE PROGRESS 



New light may be thrown upon man's origin from an entirely 

 different direction. One school of naturalists, including the 

 most erudite of experimental biologists, now deny that there is 

 any evidence that evolution has ever taken place gradually, in 

 the manner Darwin supposed. They believe that living organ- 

 isms have progressed not by imperceptible stages, but by sudden 

 mutations or transformations. Certainly students of human 

 paleontology are not in a position to refute such a statement. 

 As far back as the Aurignacian everything is only too familiar ; 

 behind the Aurignacian all is mystery. 



