i2o Scientific Proceedings (106). 



Coefficients of Digestibility for Raw and Cooked Egg Whites. 



Subject 



For Protein of Whole Ration. 



For Protein of Whites of Eggs Only. 



Remarks. 



Eggs 

 Cooked. 



%. 



Eggs 

 Raw, 



%■ 



Diflf. (in 

 Favor of 

 Cooked). 



Eggs 

 Cooked, 

 %. 



Eggs 

 Raw, 



%• 



Diff. (in 

 Favor of 

 Cooked. 



G. S. . 



85-7 



82.6 



+3-1 



85-4 



8l.O 



+ 4-4 



Yi beaten 



L. S. . 



86.2 



82.5 



+3.7 



86.0 



80.8 



+ 5.2 



Yz beaten 



M. K. 



83.2 



83.9 



-0.7 



81.8 



82.8 



— 1.0 



All beaten 



M. F.. 



83.3 



75-7 



+ 7-6 



81.9 



71.2 



+10.7 



All unbeaten 



In these experiments the raw white was as well digested as 

 the cooked if beaten light, and the difference between the two 

 was not striking when taken half beaten and half unbeaten. 

 The greatest difference was observed when the whites were 

 swallowed with no subdivision whatever, and even then the dif- 

 ference between the cooked and the raw was only 11 per cent, 

 when as many as ten or twelve whites were taken per day. The 

 effect of beating on the coefficient of digestibility is under further 

 investigation. 



68 (1528) 



A study of the sugar and oxygen relationships in the blood of 

 dogs during exercise. 



By Ernest L. Scott and A. Baird Hastings. 



[From the Department of Physiology, Columbia University, New 



York.] 



As a phase of our investigation of the chemical changes in 

 the organism resulting from exercise, the following study of the 

 sugar and oxygen relationships in the blood of dogs was under- 

 taken. 



Samples of blood amounting to about 1 per cent, of the body 

 weight were drawn from the external jugular vein. Determina- 

 tions of the blood sugar by the MacLean method, of the oxygen 

 by the Van Slyke technique, and of the volume of the corpuscles 

 by a precision hematocrit were made every two hours during the 

 course of six-hour working periods. During these periods the 

 dogs ran on an electrically-driven, horizontal treadmill at the 

 rate of about five miles per hour. For each such experiment, we 

 made a corresponding series of control observations on the same 



