440 Chemical Differentiation of the Brain 



TABLE V. 



The ratio of the increase of the constituents of the brain of the albino rat at 

 different ages, taking the amount of each constituent found in the brain at 

 birth as unity (prepared from Table IV). 



TABLE VI. 



Rate of growth (milligrams formed per day) of different constituents in a single 

 brain of the albino rat at different age periods (prepared from Table IV). 



AGE PERIODS 



