bt G4 STORRS AGRICULTURAL EXPERIMENT STATION. 
over half as large in the former as in the latter. WithJ. F.S. 
the total income in the work experiments was nearly 20 per 
cent. larger than in the rest experiments, but the outgo in the 
urine was only three-fourths as large in the former as in the 
latter. With both subjects, the amount of solids in the urine 
was slightly larger in the work than in the rest experiments. 
Elimination of water by respiration and perspiration.—The 
differences in the elimination of water in the urine in the rest 
experiments as compared with the work experiments finds a 
ready explanation in the figures for water in the respiration 
and perspiration. The amounts of water thus eliminated by 
H. O.. averaged 2,275 grams in the work ‘experiments as 
compared with 948 grams in the rest experiments; and by J. 
F. S. 1,670 grams in the work experiments as compared with 
830 grams in the rest experiments. In other words, it is 
evident that the'water eliminated by the kidneys depends upon 
the ratio of water in the food and drink to water of respiration 
and perspiration. The kidneys rid the body of the water not 
thrown off by the lungs and skin. 
It is commonly assumed that the expired air is. saturated 
-with moisture. Supposing this to be a fact, the quantity of 
water given off from the lungs would be proportional to the 
amount of expired air. In times of active muscular exercise 
the volume of this air is larger than in times of rest, and, 
consequently, the amount of water given off from the lungs 
would be larger. Furthermore, the perspiration from the skin 
increases greatly with the muscular activity. With E. O., the 
amount of water excreted per day from the lungs and skin in 
the work experiments was 2% times as large as in the rest 
experiments. With J. F. S. it was twice as large in the work 
as in the rest experiments. | 
The balance of income and outgo of water is decided not 
only by the amounts in food and drink on the one hand, and by 
the amounts eliminated by the kidneys, lungs, and skin on the 
other, but also by two other factors. One of these is the 
amount of water formed within the body by the oxidation of 
hydrogen, the other is the change in the amount of water 
in the alimentary canal and in the tissues and fluids of the 
body. This topic, however, cannot be discussed further until 
additional data which are being accumulated are available. 
