207 
remarkable Effects of a Shipwreck. 
At the end of fifteen minutes he was taken out, and stood 
three minutes, naked, exposed to the north-east wind, at the 
end of which time the mercury had sunk to 88°. A draught 
of ale was given him, and he was put into a warm bed ; in 
three minutes after the mercury rose to 9 3 0 . An hour after 
his heat was 95 0 . 
The effects produced by this alternate exposure to water 
and air of the same temperature, gave a new direction to my 
thoughts, and determined me to inquire again into this singu- 
lar phaenomenon. The most obvious method would have been 
to have prolonged the process of alternation, and replunged 
the person cooled by the external air into the bath ; but this 
was running too great a risk, unless some more sudden and 
certain method could be found of restoring the heat that might 
be lost. It was prudent, therefore, to proceed more cautiously. 
In the next experiment I resolved to try the methods of heat- 
ing as well as cooling the body. 
EXPERIMENT III. 
On the following day, at the same hour, the same person 
was again immersed in the salt-water bath. His heat previ- 
ously was g8°, his pulse 100. 
The 
temperature of the air 
and the atmosphere, as 
before, 44 0 . 
The mercury sunk ra- 
pidly to 90°. 
2 minutes after 
88 ° 
10 minutes after - 94°^ 
3 
88 
11 - 
- -9 H 
4 " 
88 x 
12 - 
- “95 
5 
9 ° i 
h 3 - 
- “ 9 6 
6 
92 
14- 
- - 96 
7 
9 2 
15 - 
— •- . 9 e 
8 
94 
16- 
- 9 6 
9 
£4 
E e 2 
