Summary 369 



remains that should be honored as the common ancestor of 

 man and the anthropoid apes. 



Professor J. Arthur Thomson of Aberdeen says, '' From 

 a modal interpretation, organic evolution has advanced to 

 the rank of a causal theory, the most convincing part of 

 which men will never cease to call Darwinism." But never 

 is a long time, and if evolution is a living process today, we 

 may discover tomorrow a still more convincing part of a 

 causal theory. 



