368 



S. HATAI 



TABLE 3 



Showing the nitrogen content of non-proteins taken together, as well as the nitrogen 

 of the amino-acids, the urea and the ammonia in the brain of the adult 



albino rat 



organs of other mammals. This low value is probably due to 

 the fact that the brain solids contain 50 per cent or more lipoids, 

 which very likely has no close relation to the nitrogenous organic 

 extractives. 



AMINO-ACID NITROGEN 



The amino-acid nitrogen is also quite uniform as in the case of 

 the non-protein nitrogen. The average value of 65 mg. is very 

 close to that given by th'e muscles, the pancreas and the spleen 

 of the dog (Van Slyke and Meyer, '13-'14). 



However, the amino-acid nitrogen in terms of myehn free 

 solids (active cell substance) must be considerably higher in the 

 brain than in these other organs. 



