[ 466 3 
VIII. A piece of bees wax, placed in the fame fitna- 
tion with the albumen ovi of the preceding experiment, 
and expofed to the fame degree of heat in the hove, be- 
gan to melt in five minntes : another piece fufpended by 
a firing, and a third piece put into the tin vefTel and fuf- 
pended, began like wife to liquify in five minutes. 
OBSERVATIONS. 
That heated airfliould have fuch a fpeedy and power- 
ful effeft in quickening the pulfe, while the animal heat 
is little altered from its natural flandard ; that the human 
body fhould fo eafily bear to be furrounded with air 
heated to 224°; that the albunleJ^ ovi^ which begins to 
coagulate in water at 150°, fliould remain fluid in 224°; 
and that the fame albumen ovi, ftill placed in air heated to 
2 24'^, fliould coagulate if in conta<ft either with tin or its 
own fhell, are faffs as Angular as they are difficult of ex- 
planation. From the different effects of heated air on 
the pulfe and the heat of the body, do we not difcover 
the fallacy of that theory of animal heat which has been 
adopted by boerhaave and other celebrated phyflolo- 
gifts ? They fuppofe that animal heat is produced by the 
attrition of the globules of the circulating fluids againff 
the Ades of the containing veflels ; but in feveral of the 
preceding experiments, the circulation was amazingly 
quickened with little increafe of the animal heat. But 
whence is it that the human body can bear without im- 
mediate injury, to be furrounded with air heated to 224°? 
And whence is it,, that the albumen ovi does not coagulate. 
in 
