200 THE ANATOMY OF SCIENCE 



havior of weights and electric charges and 

 chemical reagents; on the other hand, the be- 

 havior of man. These require two distinct vo- 

 cabularies, and most writers who describe ani- 

 mal behavior have adopted the one or the other. 

 We have the "nature fakers," who make animals 

 think and act just like men, and there are the 

 others, who regard the swarming of bees as a 

 sort of chemical reaction. I do not know which 

 of these two extremes to regard as the more 

 futile, for both extrapolations go far beyond 

 what is now justifiable. Yet the attempt to 

 bridge this vast gulf is a legitimate aim of 

 science. 



Extremely interesting results have been ob- 

 tained through a careful study of those blind 

 tropisms which drive organisms hither and 

 thither without Siny apparent choice of their 

 own. We see creatures impelled by gradients of 

 temperature or concentration, by light and by 

 chemicals, and we suspect that this willy-nilly 

 obedience to such tropisms occurs also in more 

 highly developed creatures, and may explain 

 many of the acts of man. But there is a prevail- 

 ing taboo against any attempt to trace in the 

 opposite direction the mental processes of man 

 into the animal kingdom. Even the mind of man 



