446 J.C. Draper—Heat produced in the Body, 
while in the bath. My dress during this phase of the experi- 
ment consisted of a thin flannel summer undershirt, lnen 
drawers, and cotton socks. At the completion of the hour of 
rest these were removed with as little exertion as possible and 
I stepped into the bath, and lay down, allowing only the head 
to project above the surface of the fluid. At the close of an 
hour the temperature of the bath was again taken. I then left 
it, and drying the surface of the body, reassumed the same 
dress and lay down on the sofa. Throughout the whole of 
each experiment, the temperature of the air, the dew point, the 
temperature of the bath, of the armpit, mouth and temple were 
‘taken, together with the rate of respiration and of the pulse. 
Since in these experiments two series of phenomena are 
investigated, I have for the sake of clearness of description 
separated the results in accordance with the phenomena 1D 
question, and direct attention first to the 
Quantity of heat evolved from the body. 
During Rest. Motion 
ist Exper 2d Exper. 3d 
July 4 July 5 July 11 
Temp. of air, -.-. 90° F 4° FB, ae 
Wet bulb thermometer, - -_---- 78° F. 76° F. 74°F. 
Experiment commenced at --.. 11.45 a.m. 12.10 p.m, 11.50 A.M 
Temp. of water when drawn,--_ 734° F. 734° F, 75° F. 
Temp. of water at the end of) — . 53°F. 
‘ an hour on entering the bath, 2 eae ee 
emp. of water at the close of ‘ : oo F. 
an hour on leaving the bath, 764° F. 764° F. 7 
2° ¥. q° Be 2 es 
d rror, 
‘Volume of water in the bath, 74 cubic feet. 
Volume of the : 3 ee 
Weight of the body, 180 Ibs. 
Height of the body, 5 feet 54 inches. 
In the first and second experiments I laid perfectly still ; the 
results therefore show the quantity of heat passing off from 
the surface of the body in a state of rest. This, as the table 
ps Sas in one hour. The volume of the body being three 
cubic feet, it follows that if we consider the specific heat of the 
ody itself about five degrees of Fahrenheit’s scale. The con- 
verse of this may also be considered as true, viz., that after 
th, the air being at 78°, enough heat is lost in the course of | 
an hour to cool the body five degrees, at least during the first 
hour, It is therefore a fact of considerable importance from 4 
