Introduction. 9 



from 0.00 to 0.09 per cent by 0.01 intervals. The side argument is 

 from 78.50 to 80.50 by 0.10 intervals. 



TABLE 12. Factors and their logarithms for converting dry gases at 

 C. and 760 millimeters pressure to the observed pressure (cor- 

 rected to C. for scale correction) and to saturation at 37 C. 

 (body-temperature). Formula : 760/p - 47 X 310/273 X volume 

 at C. and 760 millimeters pressure. 



The table is calculated for each millimeter barometric pressure 

 from 738 to 781 by means of the formula above. The expression 

 760 /p 47 represents the change from 760 millimeters pressure dry 

 to the prevailing barometric pressure with pressure of aqueous vapor 

 at 37 C. (47 millimeters mercury) subtracted from it, that is, to the 

 pressure of the air in the lungs. The expression 310/273 represents 

 the effect of the change from C. to 37 C. (The temperature of 

 the lungs may not be actually 37 C., but somewhat lower. It is 

 usually assumed that it is 37 C.) The table is useful in calculating 

 the volume per respiration where the total ventilation per minute of 

 the lungs at C. and 760 millimeters pressure dry and the respira- 

 tion rate are known. The side argument is in millimeters. 



TABLE 13. Calorific values of oxygen and carbon dioxide for non- 

 protein respiratory quotients and proportions of energy from 

 carbohydrates and fat consumed. 



The table is that of Zuntz and Schumburg, Physiologic des 

 Marsches, 1901, p. 361, as elaborated by Williams, Riche and Lusk 

 in the Journal of Biological Chemistry, 12, 1912, p. 357. The 

 logarithms of the calories per liter of oxygen are the logarithms of 

 the factors as they appear in this table. They differ slightly from 

 those in the original table. The values for carbon dioxide are from 

 Benedict and Talbot, Carnegie Institution of Washington, publica- 

 tion 201, 1914, p. 29. 



The table is used for calculating the heat derived from carbo- 

 hydrate and fat when the respiratory exchange is measured. It is 

 the practice of the Nutrition Laboratory to apply the calorific values 

 in this table directly to the respiratory exchange as measured without 

 computing separately the protein metabolized. The side argument 

 is the respiratory quotient in 0.01 intervals. 



TABLE 14. Heat-production per minute, per hour, and per 24- hours, 

 calculated from consumption of oxygen per minute at respiratory 

 quotient 0.82. (Calorific value of oxygen per liter = 4.825 

 calories.) 



The table is obtained by finding the product of the cubic centi- 

 meters per minute, the calorific value of oxygen (4.825), and 1, 60, 



