CALCULATION OF RESULTS. 95 



ments, namely, where excessive muscular exercise is performed, the 

 condensation of moisture may be so great as to cause the condensed 

 moisture to drop off and collect in troughs which are specially provided 

 for this purpose. The water thus collected may in some experi- 

 ments amount to several liters, and this amount must be duly consid- 

 ered when calculating the total output of water from the body. This 

 condensed water is commonly termed the ' ' drip ' ' water, and its col- 

 lection is described in detail on page 23 in connection with the water- 

 absorbing apparatus. In the final calculations, therefore, for the total 

 water output, we take into consideration not only the fluctuations 

 in the residual amounts of water vapor in the air of the chamber, but 

 also the amount of condensed water on the absorbing system. The 

 amount of water thus condensed is readily determined by weighing the 

 heat-absorbing system. (See p. 161 . ) In all alcohol experiments and in 

 rest experiments with men, care is taken to regulate the temperature 

 of the water which brings away the heat, so that the heat-absorbing 

 system is never cooled below the dew-point. Condensation of moisture 

 and the necessity for collecting drip water are thereby obviated, and 

 it is therefore seldom necessary to make this correction except in work 

 experiments. 



The tabular form for computing the total output of water is given on 

 page 181. 



COMPUTATION FOR TOTAL INTAKE OF OXYGEN. 



Fluctuations in the residual amounts of oxygen are usually much 

 greater than the fluctuations in the residual amounts of water vapor, 

 and consequently it is more often important to take these fluctuations 

 into consideration. The variations in the residual amounts of oxygen 

 are expressed in terms of liters. By dividing by the factor 0.7, the 

 amount in liters is converted to the weight in grams. The corrections 

 for the variations in the residual amount are applied to the weight of 

 oxygen admitted from the steel cylinders. If the amount of oxygen 

 remaining in the chamber at the end of the given period is less than at 

 the beginning, the weight of the amount of oxygen thus used must be 

 added to the weight admitted with the cylinders to obtain the true 

 weight of oxygen consumed by the subject. Conversely, when there 

 has been a storage of oxygen in the system in a given period, the 

 amount thus stored must be deducted from that admitted from the steel 

 cylinders. The tabular form for computations is shown on page 184. 



