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and Experiments upon Pus . 
6 . The fused residues (5), being treated in the manner de- 
scribed in a former paper, Phil. Trans. 1809,?- II. p. 32 6 — 329, 
I found they consisted chiefly of muriate of soda, phosphate of 
lime, and potash; with strong indications of carbonate of lime, 
and a sulphate ; besides traces of phosphate of magnesia, 
oxide of iron, and verifiable matter, probably silica. On a 
reasonable calculation, it appeared, that in the serous kind of 
pus, the muriate of soda amounts to from one and a half, to two 
per 1000 ; the phosphate of lime to one, to one and a half per 
1000 ; the potash to one half, to three fourths of a part in 
this quantity ; and the other matters together, to half a part 
in 1000. In the curdy matter , the second kind, the muriate of 
soda amounts to three fourths of a part, to one in a 1000; 
the phosphate of lime to one ; the potash to less than one 
half ; and the other matters united, to half a part in a 1000. 
The first kind of pus, the cream-like , and the fourth, the viscid , 
afforded from the melted residue, the same substances as the 
serous kind, excepting a somewhat smaller proportion of 
muriate of soda, and potash. 
7. The brittle residues of evaporated pus, after decanting 
the limpid fluid (4), being treated with fire as above related, 
the remaining matters were melted with more difficulty, and 
less completely, and contained a smaller proportion of muriate 
of soda and potash than the original pus. 
8. The decanted limpid fluids (4), being evaporated to dry- 
ness, these residues were exposed to Are. They were melted, 
and then afforded a larger proportion of muriate of soda and 
of potash, than the pus itself ; but with tne same proportion 
of the other saline and earthy substances. 
