IN THE TEMPERATURE OF THE HUMAN BODY. 11 
No. X.—From 11.10 a.m. tll 12.40 p.m. 
99° 100° Temperature of air 62° F. A cloudy, breezy day. At 
ET oR 11 walked about 200 yards on to a beach, and sat down 
on the shingle at 11.5, where there was a slight side 
breeze. Hands and feet a little cold. 
Sun covered by clouds until 11.35, after which it be- 
gan to shine; immediately after which began to feel 
warm, and continued to get warmer until 12.7, when at 
12.7 a cloud covered sun until 12.11. During time sun 
covered, several chills came over body. 
Walking in sun from 12.16 onward. 
99° 100° Clad in thin merino next skin and summer clothes. 
No. XIl.—F rom 3 p.m. till 6 P.M. 
Temperature of air 66° F., slowly diminishing 
to 64°F. Sitting on a beach from 3 until 5, 
after a dinner at 2.15-2.45. A slight face 
breeze. Intheshade. Warm until 4.15, when 
feet: began to get a little cold, and by 5 so cold 
that obliged to move about. At 5 began to 
walk slowly, and had to go up several steps. 
At 5.20 began to walk briskly. Began to 
perspire at 5.25. Continued walking, per- 
spiring until 6. 
Clad as in last. 
To explain these Tables :— 
The actual temperature of the body at any given moment must be 
the resultant of (1) the amount of heat generated in the body, and 
(2) the amount lost by conduction and radiation. 
(1.) The source of heat in the body is not considered in this paper ; 
and no more will be now said of it, except that there is every reason 
to believe that it is not in the skin itself, and that, for the short 
periods through which each observation was made, it is approximately 
uniform. 
(2.) The loss of heat from the body is modified by changes in the 
skin and by changes in the surrounding media; and these two are 
mutually dependent. 
It has long been known that cold contracts and heat dilates the 
small arteries of the skin, respectively raising and lowering the arte- 
rial tension, and thus modifying the amount of blood in the cutaneous. 
capillaries. 
But modifications in the supply of blood to the skin must alter 
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