88 



ANATOMICAL NOTES ON MALAY APES. 



teenth of its bodily weight, while its stomach weighed a little 

 over one-hundredth. 



Chart II looks as if it did not bear out the .statement 

 that increase of brain means decrease of stomach. The orang 

 is quile out of line, and in connection with this I would point 

 out that the development of the brain seems not to be govern- 

 ed by the law that regulates the growth of other organs. 

 The relative amount of brain matter is greatest in fcetal life ; 

 from that point onwards to full growth it diminishes. I tabu- 

 late the statistics derived from mother and child in the follow- 

 ing species : — 



Species. 



Weight of Adult 

 Brain. 



Juvenile or Fcetal 

 Brain. 



Actual. 



Relative. 



Actual. 



Relative. 



Female Hylobates lar, 

 Semno. albocinereus, 

 Papio nemestrinus, ... 

 Bitch and Pup, 



1,620 grs. 

 1,160 ,, 



i,34o >, 

 1,180 ,, 



.017 

 .016 

 .019 

 .0056 



85 g r s. 

 460 „ 



i,3 00 ii 

 595 *> 



.12 



.060 



.216 



.0218 



Contrast this with the spinal cord development :— 



Species. 



Weight of Spinal 

 Cord in Adult. 



Weight of Spinal 



Cord in Baby 



and Pup. 





Actual. 



Relative. 



Actual. 



Relative. 



Papio nemestrinus, . . . 

 Bitch and Pup, 



175 grs. 

 290 grs. 



.0025 

 .0014 



26 grs. 

 3 8 grs- 



.0040 

 .00138 



The other organs of the body increase much in ratio with 

 the rest; it is so with the spinal cord, but the brain grows with 

 no relation to the state of the other organs, save the stomach, 



