48 The Destiny of Man. 



ments. In the higher apes the cerebrum 

 begins to extend itself forwards, and this 

 goes on in the human race. The cranial 

 capacity of the European exceeds that of 

 the Australian by forty cubic inches, or 

 nearly four times as much as that by 

 which the Australian exceeds the gorilla ; 

 and the expansion is almost entirely in the 

 upper and anterior portions. But the in- 

 crease of the cerebral surface is shown not 

 only in the general size of the organ, but 

 to a still greater extent in the irregular 

 creasing and furrowing of the surface. 

 This creasing and furrowing begins to 

 occur in the higher mammals, and in civ- 

 ilized man it is carried to an astonishing 

 extent. The amount of intelligence is 

 correlated with the number, the depth, 

 and the irregularity of the furrows. A 

 cat's brain has a few symmetrical creases. 

 In an ape the creases are deepened into 

 slight furrows, and they run irregularly, 

 somewhat like the lines in the palm of 

 your hand. With age and experience the 



