Donaldson, Growth of Central Nervous System. 361 



WEIGHT RELATION OF THE BRAIN TO THE SPINAL CORD. 



The weight relations of the brain and spinal cord change with 

 age. Using the calculated values, it appears that for a very short 

 period after birth the brain grows more rapidly than the spinal 

 cord (see body weight 15 gms., table 7) but at about the body 

 weight of 15 to 25 gms., the cord begins to grow more rapidly than 

 the brain, and from that time on the ratio of the brain weight 



TABLE 7- 



Showing the ratio of the weight of the spinal cord to that of the brain in the albino 



rat. 



