OUR FACE FROM FISH TO MAN 



of which in turn is to play off one stimulus against 

 the other and to shape the motor responses into 

 profitable combinations. In this case the shark's 

 face is innocent of cruelty or piracy and is merely 

 an assemblage of coordinated instruments of pre- 

 cision packed into the forepart of a vessel of 

 appropriate streamline form. 



At this place we do not have to discuss what 

 brought about this marvelous aggregation of 

 coordinated apparatus. All we need emphasize 

 is that in the face of a shark a man may behold, 

 as in a glass darkly, his own image. 



Nevertheless a man should not flatter himself 

 that he is a direct descendant of some powerful 

 robber-baron such as the tiger-shark. Always in 

 earlier times we have been only the little stealers 

 of small fry and even when we attained the 

 mammalian grade we were still specializing in 

 capturing small living things. 



THE MASK -FACE OF OUR GILLED ANCESTORS 



A skull finds but little favor with the man in 



the street and possibly it would not interest him 



much to be told that every one of his twenty -eight 



skull bones has been inherited in an unbroken 



20 



