CHAPTER 9 

 GROWTH OF CHEMICAL CONSTITUENTS 



1. In the body as a whole. 2. Osseous system. 3. In the nervous sj^stem. 



1. In the hodij as a whole. For the body as a whole Hatai ('17) 

 has made a determination of its composition in terms of proteins, 



TABLE 166 

 Giving the chemical composition of the albino rat — Hatai ('17) 



Body, grams 



Water, per cent 



Solids, grams 



Percentages of solids. 



Percentage of solids in 



Residue 



Per cent of moist weight. 



Fat 



Per cent of moist weight. 



Organic extract 



Per cent of moist weight. 



Soluble salts 



Per cent of moist weight. 



Fixed salts 



Per cent of moist weight. 



294 



277.5 

 65.3 

 96.4 

 34.7 



44.5 

 15.5 



16.5 

 5.7 



28.2 

 9.8 



2.5 

 0.8 



8.3 

 2.9 



fat, organic extract and salts, at eight ages. The results are 

 given in table 166 and Chart 56. 



The following paragraphs define the terms used in table 166. 



Residue. The residue is represented by the solids from which all the organic 

 substances soluble in both boiling alcohol and in water, as well as the salts haye 



312 



