Ie -F 
102 STORRS AGRICULTURAL EXPERIMENT STATION. 
nevertheless brief reference may be made to a few of them in 
order to illustrate some of the ways in which the experiments 
are throwing light upon the fundamental questions of the met- 
abolism of matter and energy in the body and, consequently, 
upon the general laws of nutrition. It is believed that the data 
already obtained are sufficient for the discussion of a number of 
problems. ‘These include (1) food materials supplied and con- 
sumed and the difference in the amounts demanded by men at 
rest and at work, (2) the elimination of water, (3) the elimi- 
nation of carbon dioxid, (4) the metabolism and elimination of 
energy, and (5) the income and outgo of energy. ‘These are 
all topics of general interest. Most of the physiological text- 
books and other works bearing on these subjects contain more 
or less detailed statements concerning them, and in some of 
them figures are quoted which have been generally accepted. 
It appears that in many cases these figures rest upon much less 
experimental evidence than is furnished by the experiments 
with the respiration calorimeter. In the construction of this 
apparatus it was possible to make use of the experience and 
results of earlier investigators, and it seems not unreasonable 
to suppose that the later methods have yielded results of a 
character which it was not possible to obtain previously. It is 
not impossible that future investigations will modify the figures 
which are here given, and any deductions that may be drawn 
from them; but it is believed that these results are of sufficient 
interest to warrant their publication and that they rest upon 
sufficient experimental evidence to make them useful for some 
time to come. 
THE, MEN WHO SERVED AS SUBJECTS. 
Four different men, FE. O:.,0. F..T., A. W.S., and’ J.-Pas2 
have served as subjects in these experiments. ‘They were all 
in excellent health. E. O. was a laboratory assistant, a Swede 
by birth, who had been a number of years in this country. At 
the time of the experiments here recorded he was about thirty- 
two years old and weighed not far from seventy kilograms 
(154 pounds). A. W. S. was a physicist, a native. of New 
England, twenty-five years old, and weighed about seventy 
kilograms (154 pounds). O. F. T., a chemist, the subject of 
but one experiment, No. 3, was also a native of New England, 
