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439 



TABLE IV. 



Absolute weights, in milligrams, of the constituents of a single brain of the 

 albino rat at different ages (prepared from Table HI) . 



Absolute weights in milligrams. 



In absolute weight in milligrams of sulphur. 



In absolute weight in milligrams of phosphorus. 



* Record from average duplicate analyses. 



t Record from one analysis. 



t Figures in parentheses in this section refer to Chart III. 



Figures in parentheses in this and the following sections refer to Chart IV. 



