C *15 ] 
floor where he flood conflantly wet. Having remained 
here fifteen minutes, he went into the heat of 130'^; at 
this time the heat of his body was 100°, and his pulfe 
beat 126 times in a minute. While Dr. fordyce flood in 
this fituation, a Florence flafk was brought in, by his or- 
der, filled with water heated to i o 0°, and a dry cloth, with 
which he wiped the furface of the flafk quite dry ; but it 
immediately became wet again, and ftreams of water 
poured down its fides ; which continued till the heat of 
the water within had rifen to 122% when Dr. fordyce 
went out of the room, after having remained fifteen mi- 
nutes in an heat of 1 3 0° ; jufl before he left the room his 
pulfe made 139 beats in a minute, but the heat under 
his tongue, in his hand, and of his urine, did not exceed 
1 00 °. Here Dr. fordyce obferves, that as there was no 
evaporation, but conflantly a condenfation of vapour on 
his body, no cold was generated but by the animal pow- 
ers. At the conclufion of this experiment. Dr. fordyce 
went into a room where the thermometer flood at 43'’, 
dreffed himfelf there, and immediately went out into the 
cold air, without feeling the leafl inconvenience; on 
which he remarks, that the tranfition from very great 
heat to cold is not fo hurtful as might be expe6led, be- 
caufe the external circulation is fo excited, as not to 1^ 
readily overcome by the cold. Dr. fordyce has fince 
had occafion, in making other experiments, to go fre- 
quently into a much greater heat, where the air was dry, 
and to flay there a much longer time, without being af- 
fedled nearly fo much, for which he affigns two reafons ; 
VoL. LXV. R that 
