EXPERIMENTS ON METABOLISM OF ENERGY. 2g Ba 
The variations in the amounts excreted from day to day in 
experiments of the same kind with the same man were very 
wide. Thus, in the rest experiments with E. O. the urine fell 
on one day to 1,091 grams with 1,037 grams of water, while on 
another day it rose to 3,208 grams with 3,120 grams of water. 
It is to be observed that these experiments were made at differ- 
ent times during a period of two years and covered in all twenty- 
fivedays. In the rest experiments with A. W. S., on the other 
hand, there is but one experiment covering three days. Al- 
though the quantities of water in the food and drink were 
almost exactly the same from day to day, the quantities of 
urine and water in the urine were irregular, the range being 
from 1,681 grams of urine containing 1,628 grams of water to 
1,965 grams of urine containing 1,909 grams of water. In the 
rest experiments with J. F. S. the quantities ranged from 975 
grams of urine containing 913 grams of water to 1,551 grams 
of urine containing 1,489 grams of water. ‘These extremes 
occurred respectively on the first and third days of the first 
experiment with this subject. 
In the work experiments with E. O., made at intervals of 
over a year, the water of food and drink ranged from 2,151 to 
3,079 grams per day. ‘There were corresponding variations in 
the amount of urine and of water in the urine, though the 
range was not wide, the minimum amount of urine being 879 
grams containing 815 grams of water, and the maximum 1,350 
grams containing 1,275 grams of water. In the work experi- 
ments with J. F. S., which were made at short intervals during 
the same year, the water of food and drink ranged from 2,166 
to 2,286 grams, and the variation in the amount of urine per day 
was from 695 grams of urine containing 641 grams of water, 
to 1,488 grams of urine containing 1,433 grams of water.. 
In comparing the averages of the rest and work experiments 
with both subjects EK. O. and J. F. S., it will be observed that 
while the quantity of water in the food and drink was con- 
siderably larger in the work than in the rest experiments, the 
amounts of urine and water in the urine were larger in the 
latter than in the former. The differences, however, varied 
with the two subjects. Thus with HE. O. the total income of 
water was over Io per cent. larger in the work than in the 
rest experiments, but the outgo in the urine was but a little 
