7 
into granulations or new Flesh. 
It is so easy for any one to bring the facts which I have 
stated under his own observation, that I shall leave them to 
speak for themselves, but it may appear to my audience, that 
farther evidence is required to establish the doctrine, that 
they are produced entirely by the coagulation of the pus, and 
the extrication of the carbonic acid gas. To remove every 
objection which it occurred to me could be made, I put the 
doctrine to the test of the following experiments. Immedi- 
ately after the exposure of the surface of the sore, I poured 
water at the temperature of 95 0 upon it, which washed away 
all the pus and although the sore was left exposed in this 
state ten minutes longer, none of the above mentioned ap- 
pearances were produced, so that the presence of pus is ne- 
cessary to their taking place. 
As cold water has a power of coagulating pus more ra- 
pidly than simply exposure to the atmosphere, I applied 
water at the temperature of 65°, to a sore, and all the ap- 
pearances were produced in so much greater a degree, that 
I requested Mr. Bauer would make a drawing of a portion 
of a sore that had been exposed for fifteen minutes under 
common circumstances, and at the end of that period to pour 
upon it water at the temperature of 65°, and, in ten minutes 
more, begin a second drawing of the same surface, showing 
to how much greater an extent the appearances had taken 
place ; by this means proving, that the degree of coagulation 
was the great cause of the effects that followed. These 
drawings are also annexed. 
As a saturated solution of sal ammoniac has a greater 
power of coagulating pus than any substance that I am ac- 
quainted with, (and on that account, in the year 1788, I 
