and Experiments upon Pus. 
perfectly opaque white matter. It was almost inodorous. To 
the touch it was quite smooth. The specific gravity was 
nearly that of the second kind of pus. 
On standing 24 hours, about one ounce measure of limpid 
fluid rose to the top of the whole mass. Putrefaction did not 
take place so soon as in expectorated matter of the same 
consistence. 
The examination by the microscope manifested innumerable 
spherical particles among leafy masses, and numerous par- 
ticles of irregular forms. 
The simple properties were otherwise similar to those of 
the other sorts of pus, above distinguished. 
Many other differences cf purulent matter are universally 
recognized ; but they are either varieties of the four kinds 
already named, or the differences depend upon the obvious 
mixture with adventitious substances ; such as the red part of 
the blood, coagulated lymph, serum, putrefied matter, fibrous 
and membranous masses, calculi, &c. : therefore, I deem it 
useless to describe them. 
Sect. II. Agency of Caloric. 
1. The above kinds of pus coagulated like serum of blood, 
into a firm, uniform, soft solid, at the temperature of 165° 
completely ; but partially at 160° of Fahrenheit’s ther- 
mometer. 
2. The decanted limpid fluid from pus, Sect. I. — I. II. III. IV, 
coagulated completely into a firm uniform mass, like serum of 
bkod, at 16*5°, but it became opaque and thickened at ib'o°. 
By pressure of the firm curd thus produced, a watery liquid 
was separated, which on due evaporation did not give a jelly, 
but was coagulabie like the decanted liquid just mentioned. 
