Metabolism Experiment No. 59. 



43 



While these changes are small, amounting to less than 4 calories for the 

 whole day, and while it may appear that other discrepancies much greater 

 are neglected, nevertheless it is our custom to include this change in an endeavor 

 to secure the greatest possible accuracy with every factor determined by 

 means of this apparatus. An extended discussion of the errors involved in 

 the different determinations is given elsewhere. 10 



Correction for temperature of water and dishes. In addition to the heat 

 brought away by the water-current, there are minor changes in the amount of 

 heat in the chamber resulting from the introduction of material at a tem- 

 perature below or above that of the chamber. In fasting experiments these 

 changes are at a minimum and consist chiefly of the introduction of cold 



Table 12. Heat reduced to terms of C- Metabolism experiment No. 59 



(December 18-19, 1903). 



drinking-water contained in glass bottles. Occasionally the urine or feces may 

 be withdrawn before they reach the temperature of the chamber. In all cases 

 the time at which the material is put in or taken from the chamber, the nature 

 of the material, and the weight and temperature are recorded. The amounts 

 of heat lost or gained by the water-current due to the differences between 

 the temperature of the calorimeter and the water and dishes used on the 

 first day of experiment No. 59 are given in table 13. The specific heat of glass 

 is taken as 0.2. From the specific heat of the material, the weight in grams, 

 and the differences between the temperature of the material and the calorimeter 

 chamber, the quantities of heat absorbed or given off are computed. 



In only one instance during this experiment was any material introduced 

 into the respiration calorimeter above the temperature of the chamber. At 

 4.30 p. m., December 18, four glass urine bottles, weighing 1743 grams, were 

 introduced at a temperature 1 above that of the chamber. All other cor- 



10 Carnegie Institution of Washington Publication No. 42; U. S. Dept. of Agr., 

 Office of Exp. Sta. Bui. 175. 



