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Dr. Pearson's Observations 
Sect. III. Agency of Water. 
l. After decanting the limpid fluid from off half a pint 
of the four kinds of pus as above related, (Sect. I.) three 
ounces measure of distilled water were mixed with each 
of them. After 4,8 hours repose, a limpid fluid of nearly the 
quantity of two ounces by measure, was seen forming an 
upper stratum to the pus. It was decanted for examination. 
( а ) On exposure to fire it became turbid like milk, as soon 
as the temperature was elevated to 165°, but did not become 
thicker at a greater elevation. 
(б) On evaporation to dryness, the residue amounted to 
about one fifteenth of the weight of the liquid from the serous 
pus, and to one twentieth from the three other kinds ; in place 
of about one tenth, as from the first decanted liquid, (Sect. 
I. 4) ; and as from serum of blood. The residuary matters 
were of the same kind as those above described. Sect. II. 2 — 6 . 
( c ) Three ounces measure of distilled water having been 
again mixed with each of the four kinds of pus, and in 48 
hours, two ounces measure of decanted limpid fluid from each, 
having been evaporated to dryness, residues of the same kind. 
In the same proportions, and in nearly the same quantities as 
before, were obtained (6). These decanted fluids became 
nearly as turbid as the former, on raising their temperature 
to 165°. 
{d) Distilled water was added a third time in the quantity 
of eight ounces by measure, to each of the four parcels of pus 
under examination, and after 48 hours repose, six ounces of 
limpid fluid were poured off from each of them. At the tern- 
perature of 16 the decanted fluids became turbid; that of the 
serous pus more so than the others. On evaporation to dryness* 
