
230 STORRS AGRICULTURAL EXPERIMENT STATION. 
In this experiment the subject was engaged in active mus- 
cular work. ‘The energy of the external muscular work done 
was assumed to be entirely transformed into heat within 
the chamber. The larger part was first transformed into 
electrical energy by a small dynamo which was belted to the 
wheel of a stationary bicycle, and was then transformed into 
heat by an electric lamp through which the current passed. A 
small portion was transformed into heat by the friction of this 
bicycle-dynamo or ergostat. The heat thus produced was 
measured with the heat given off from the body. ‘The mus- 
cular work was continued for about eight hours per day, 
and the external muscular power as roughly measured by 
this ergostat was estimated to be equivalent to not far from 
250 calories per day. ‘This measurement was not as accurate 
as desirable and a special apparatus is now being constructed 
for the purpose. In experiment No. 9 the subject was as 
quiet as he well could be. In the four days of the preliminary 
period he moved about but little, and engaged in no consid- 
erable amount of either muscular or mental labor. During 
the four days passed in the chamber he was likewise quiet, but 
did a small amount of reading and writing to pass away the 
time. 
The series of tables which embody the statistics of these 
experiments include a considerable number, of which four are 
cited herewith as specimens. ‘Table 52 gives a summary of 
measurements of the volume of the ventilating air current and 
of the determinations of carbon dioxide in this current. 
In table 53 is a corresponding summary of the determinations 
of water in the air current. ‘Table 54 summarizes the heat 
measurements. ‘The data briefly condensed in these tables were 
obtained during the four days of the actual metabolism experi- 
ment when the man was in the chamber. The full details, 
however, are quite extensive and are reserved, with the cor- 
responding explanations, for later publication. ‘Tables also 
too bulky for insertion here give the results of analyses and 
determinations of heats of combustion of the urine. 
The data of these tables, and of those for the corresponding 
digestion experiments in the article on Experiments on Diges- 
tion of Food by Man (pages 1 54-167 of the present Report) 
are used for calculating the quantities of nutrients in the food 



