438 Chemical Differentiation of the Brain 



TABLE III. 



The relative proportions of the constituents of the brain of the albino rat at 

 different ages (averages from Table II) . 



Constituents in per cent of total solids. 



Distribution of sulphur in per cent of total S. 



Distribution of phosphorus in per cent of total P. 



* Record from average duplicate analyses, 

 t Record from one analysis only. 

 J Taken from analysis, W. 8. 

 Obtained by difference. 



