56 PRIMEVAL MAN. 



The difference between the hand of a monkey 

 and the hand of a man may seem small when 

 they are both placed on the dissecting table ; 

 but in that difference, whatever it may be, lies 

 the whole difference between an organ limited 

 to the climbing of trees or the plucking of 

 fruit, and an organ which is so correlated with 

 man's inventive genius that by its aid the Earth 

 is weighed, and the distance of the Sun is 

 measured. In like manner let us assume it 

 to be true that the difference between the 

 brain of Man and the brain of the Gorilla 

 may be reduced to a difference of volume, 

 to that visible difference alone, and even as 

 regards volume to a difference in quantity 

 comparatively small. " Cranial capacity " is 

 measured by the cubic inches of space which 



