PERCENTAGE OF WATER 



131 



the conditions of comparison, the female brains are the older. 

 Owing however to the relatively large interval of brain weight 

 used in the correlation tables, from which the means in table 5 

 were obtained, the absolute weights for the amounts of water 

 increase irregularly, and this in turn makes the progressive per- 



TABLE 5 



The weight of water present in the brain and in the spinal cord according to the abso- 

 lute weight of these organs. Sexes distinguished. Based on the entire series of 

 records for both sexes. Mean values determined from correlation tables. 



centages still more irregular. However, a second series of calcu- 

 lations based on the theoretic curve for the percentage of water 

 (see table 3 and chart 3) agree so well with the observed results 

 here given that the general correctness of the latter may be 

 accepted. 



