BY J. M. PETRIE AND H. G. CHAPMAN. 309 



219gm. arginin copper nitrate gave 0-02372 gm. Cu. 

 (C,Hi^N^02)2-Cu (N03)o.3H20 requires 10-79% Cu. Found 

 10-83%. 



0-219 gm. arginin copper nitrate gave 0020 gm. HgO. 

 ,CeHi^N402)o.Cu(N03)o.3H20 requires 9-16% H2O. Found 

 9*14%. 



The amounts of lysin, histidin, and arginin present in 100 gm. 

 protein of egg-white are therefore — 



Lysin ,., 3-19% 



Histidin ... 0-66% 



Arginin ... 2-39% 



In conclusion, we express our thanks to Professor Anderson 

 Stuart, in whose laboratory this investigation was conducted. 



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