OBSERTATIONS AND EXPERIMENTS ON PUS. gj 



6. The fused residues (5), being treated in the manner 

 described in a former paper, Phil. Trans. I8O9, P. II, 

 p. 326 — 329*, I found they consisted chiefly of muriate of 

 soda, phosphate of lime and potash ; with strong indica?* 

 tions of carbonate of lime, and a sulphate ; beside traces of 

 phosphate of magnesia, oxide of iron, and vitrifiable mat- 

 ter, probably silica. On a reasonable calculation, it ap- 

 peared, that in the serous kind of pus, the muriate of soda 

 amounts to from one and a half, to twaper 1000 ; the phos- 

 phate of lime from one, to one and a half per 1000; the 

 potash from 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 from three fourths of a part, to one in 

 1000; the phosphate of lime to one; the potash to less 

 than one half; and the other matters united, to half a part 

 in 1000. The tirst kind of pus, the creamlike, 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 decant- 

 ing the limpid fluid (4>, being treated with fire as above re- 

 lated, the remaining matters were melted with more diffi- 

 culty, and less completely, and contained a smaller pro- 

 portion of muriate of soda and potash than the original 

 pus. 



8. The decanted limpid fluids (4), being evaporated to 

 dryness, these residues were exposed to fire. They were 

 melted, and then afforded a lai ger proportion of muriate of 

 spda and of potash, than the pus itself; but with the same 

 proportion of the other saline and earthy substances. 



S^CT. III. Agency of Water. 



1. After (decanting the limpid fluid from off half a piht Action of wa- 

 of the four kinds of pus as above related, (Sect. I,) three 'eroapus. 

 ounces by measure of distilled water were mixed with 

 each of them. After 48 hours repose, a limpid fluid of 

 oejirly the quantity of two ounces by measure was seen 



♦ journal, V9I. XXV, p, 227— 2iJ9. 



forming 



