remarkable Effects of a Shipxvreck. 205- 
appointed rather for my own convenience, than as being most 
proper for the purpose. His heat was 98° before undressing, 
his pulse 100 in the minute. He was undressed in a room 
where the mercury was at 56°; and afterwards stood naked before 
the fire till his heat and pulse were examined again, and found 
as before. He then walked pretty briskly through a flagged 
passage into an open court, where the north-east wind blew 
sharply upon him : he w r as exposed to it for a minute, and 
then plunged suddenly into the water up to the shoulders. 
The thermometer, which had been kept in a jug of warm 
water, at the heat of ioo°, w r as introduced into his mouth, 
with the bulb under his tongue, as soon as the convulsive sob- 
bings occasioned by the shock were over. The mercury fell 
rapidly, and a minute and a half after immersion it stood at 87°. 
He remained motionless in the water, and the mercury rose 
gradually ; at the end of twelve minutes it stood at 93°^-. 
While he sat in the water, it occurred to me to examine his 
heat when he rose out of it into the air : I had reflected on 
the power that must be employed to keep up his heat in a 
medium so dense as w'ater, and where an inanimate body, of 
the same bulk, would have cooled so much more speedily than 
in air of the same temperature. Supposing that this heat-pro- 
ducing process, whatever it may be, might continue its ope- 
rations some time after the extraordinary stimulus (the pres- 
sure of the water) w'as removed, I expected to see the mercury 
rise by the accumulation of his heat, on changing the medium 
of water for air, and therefore kept him exposed, naked, to 
the wind two minutes after taking him out of the bath. To 
my surprise, although the attendants were rubbing him dry 
with towels during this time, the mercury fell rapidly. He 
was put into a warm bed, and his heat, when examined under 
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