INTERNAL WORK. 383 
gren, Sondén & Tigerstedt.* The experiments were made in a 
large Pettenkofer respiration apparatus and extended over twenty- 
two hours, the results being computed to twenty-four hours. The 
total heat production, as computed from the carbon and nitrogen 
balance, and the computed metabolizable energy of the food were: 
Energy of Food, | Heat Production, 
als. Cals. 
First daVGte overs za 4141.4 (2) 
ce Be merrier a saieoa coe 4277.9 2705.3 
i cape ree 0 2220 .4 
Hourth, sce teeees 0 2102.4 
an corer ere: 0 2024.1 
Seventh “00) 8 |. tor088 
Eighth “ .......... 4355.9 2436.9 
Ninth CO uaem eee A 3946.4 2410.1 
The above figures furnish a striking example of the constancy of 
the fasting metabolism, and of the marked increase brought about 
by the consumption of food. Omitting the results for the first day 
of fasting and for the first day of the experiment we obtain the 
following averages: 
Average energy of food........... 4193.4 Cals. 
Metabolism : 
With food. ........ 0... 0c e eee 2517.4 “ 
Pastingy.:.cecseecin dew ee ee es 2022.4 “ 
Increase. 
MO Galas hee Bead ec acs ewan 495.0 “ 
Per cent. of food............... 11.76 Per cent. 
It is to be noted, however, that the food in this experiment was 
considerably in excess of the fasting requirements, so that there 
was a notable storage of material and energy in the body. 
Summary.—THe results of the foregoing approximate computa- 
tions of the increased expenditure of energy for twenty-four hours 
are summarized in the following table, which also includes a com- 
parison of the metabolizable energy of the food with the fasting 
metabolism : 
* Skand. Arch. Physiol., 7, 29. 
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