Anatomical Characters of the Human Brain, 



13 



I also weighed the parts of a number of well hardened brains a 

 second time after they had been in formalin for another year. In 

 these the fluctuations of the weight are less marked and the deviation 

 of the percentage value of the frontal lobe is, if anything, less than 

 in the first set. The data are as follows. The figures given in the 

 first column are the ones entered in the charts. 



As said above, my personal equation was excluded entirely because 

 all of the breaks and weighings were made without my knowing the 

 race or sex of the individual from which the specimen came. 



In general I used Broca's method to divide the frontal lobe from 

 the rest of the cerebrum and found as he did that the mean weight 

 of the frontal lobe in both men and women is between 43 and 44 per 

 cent. The same is true for both the negro and the white. This 

 bears out what I have found by measuring the area of the genu and 

 splenium and leads to the conclusion that it is incorrect to state 

 that the frontal lobe of the negro brain is relatively lighter than 

 that of the white. 



