LEADING ARGUMENTS FOR DESCENT l8l 



4vhere it can offer many solidly founded generalizations on 

 which either sciences can build. 4 



This certainly should help to teach restraint and 

 caution to both scientist a'nd sociologist. "The 

 recapitulation theory," in fine, says Professor 

 Kellogg "is mostly wrong; and what is right in it 

 is mostly covered up by the wrong part, so that 

 few biologists longer have any confidence in dis* 

 covering the right." 5 



So exit the "biogenetic principle" that made 

 Haeckel famous, and the "recapitulation theory" 

 which is its expression; though Socialists and not 

 a few sociologists will still continue fondly to 

 accept it, without qualm, as a fact beyond dispute. 



Another argument for the descent of man from 

 the ape is that taken from the resemblance of 

 human blood to that of the higher apes. It is a 

 fact that animals belonging to groups that are 

 closely related in structure give certain blood reac- 

 tions that help to identify the group; thus lizards 

 and snakes give similar reactions, whereas turtles 

 react more like the crocodiles, so that from this 

 point of view, the turtle is said to be only re- 

 motely related to the snake or lizard. All 

 ruminants (sheep, deer, oxen) will thus be found 

 to be related by blood-tests; and what is more to 

 the point, the man-like apes give certain reactions 

 similar to those of man. Now what of this? 



'"Darwinism Today," pp. 22, 23. 

 6 Ibid. 



