688 PHILOSOPHICAL TRANSACTIONS, [aNNO 1775, 



thermometer was handed to him, in which the quicksilver already stood at 98° ; 

 but it rose only to 994^, whether the bulb of the thermometer was inclosed in 

 the palms of the hands, or received into the mouth,* The natural state of this 

 gentleman's pulse is about 65, 3, Another gentleman went through the same 

 experiment in the same circumstances, and with the same effects. 4, One of 

 the porters to the hospital, a healthy young man, and the pulse 75, was inclosed 

 in the stove when the quicksilver stood at 210°; and he remained there, with 

 little inconvenience, for 20 minutes. The pulse, now l64, and the animal 

 heat, determined by another thermometer as in the former experiments, was 

 10 1-^, 5. A young gentleman of a delicate and irritable habit, whose natural 

 pulse is about 80, remained in the stove 10 minutes when heated to 224°. 

 The pulse rose to 145, and the animal heat to 102°, This gentleman, 

 who had been frequently in the stove during the course of the day, 

 found himself feeble, and disposed to break out into sweats for 24 hours 

 after the experiment. 6, Two small tin vessels, containing each the white of 

 an egg, were put into the stove heated to 224°, One of them was placed on a 

 wooden seat near the wall, and the other suspended by a string about the middle 

 of the stove. After 10 minutes, they began to coagulate ; but the coagulation 

 sensibly quicker and firmer in that which was suspended, than in that which 

 was placed on the wooden seat. The progress of the coagulation was as follows : 

 it was first formed on the sides, and gradually extended itself; the whole of the 

 bottom was next coagulated ; and last of all the middle part of the top, 7. Part 

 of the shell of an egg was peeled away, leaving only the film which surrounds 

 the white ; and part of the white being drawn out, the film sunk so as to form 

 a little cup. This cup was filled with some of the albumen ovi, which was con- 

 sequently detached as much as possible from every thing but the contact of the 

 air and of the film which formed the cup. The lower part of the egg stood on 

 some light tow in a common gallipot, and was placed on the wooden seat in the 

 stove. The quicksilver in the thermometer still continued at 224°. After 

 remaining in the stove for an hour, the lower part of the egg, which was 

 covered with the shell, was firmly coagulated ; but that which was in the little 

 cup was fluid and transparent. At the end of another hour it was still fluid, 

 except on the edges where it was thinnest ; and here it was still transparent ; a 

 sufficient proof that it was dried, not coagulated, 8, A piece of bees wax, 

 placed in the same situation with the albumen ovi of the preceding experi- 

 ment, and exposed to the same degree of heat in the stove, began to melt in 5 

 minutes : another piece suspended by a string, and a 3d piece put into the tin 

 vessel and suspended, began likewise to liquify in 5 minutes. 



* The scale of the thermometer, which was suspended by tlie string about tiie middle of the 

 room, was of metal ; this was the only one I could then procure, on which the degrees ran so high 

 as to give any scope to the experiment. The scale of the other thermometer, which was employed 

 for ascertaining the variations in the animal heat, was of ivory,— -Orig. 



