<20 OBSERVATIONS AND EXPERIMENTS ON PUS. 



2. The decanted limpid fluid from pus, Sect. I,— *-I, 11, 

 III, IV, coagulated completely into a tinn uniform mass, 

 like serum of blood, at l65% but it became opaque and 

 thickened at l60°. By pressure of the firm curd thus pro- 

 duced, a watery liqiiid was separated, which on due evapo- 

 ration did not give a jelly, but was coaguluble like the de- 

 canted liquid just mentioned. 



The thick opaque matter, after decanting the limpid 

 fluid, coagulated as before said, into a firm mass at l65°. 

 Evaperated to 3. Each of the above four kinds of pus, being evapo- 

 ryness, rated to dryness, left in no case less than one tenth of its 



original weight, or move than one sixth ; but most fre- 

 quently one seventh or one eighth of brittle matter. The 

 smallest proportion of residue was left by the 3d, or serous 

 kind ; the largest, by the '-2d ©r curdy. These residues gene- 

 rally became rather soft, especially those of the 3d, or the 

 serous kind, after exposure to the air. 



4. The opaque part of pus after separating the limpid 

 fluid afforded on evaporation from xV to -^-^ more of brittle 

 residue, than an equal weight of the pus itself; and it re- 

 mained hard on exposure to the air. The limpid fluid, 

 evaporated to dryness, yielded about one tenth of brittle 



Residua, residue; which grew moist, and sometimes deliquesced, on 



exposure to the air. 



5. The brittle residues above mentioned (3), being ex- 

 posed to fire in platina crucibles, flamed for some time, 

 emitting a very offensive, pungent, empyreumatic smell; 

 the uninflammable residue being kept in a state of ignition 

 for a longer period, what remained at length was fused 

 readily from the serousy viz* the third kind of pus ; but in 

 the cases of the other exsiccated residues of the 1st, 2d, and 

 4th kinds of pus, they barely were melted, or only became 

 soft and claggy. The fused residues from the serous pus 

 amounted to Vo or Vt of the exsiccated pus ; and to jItj- or 

 7^5^ of the original purulent matter. Those from the second 

 kind, the curdy, amounted to -^-^ or ^^ of the dried matter, 

 and to yly or ^^^ of the pus itself. The fused masses from 

 the 1st and 4th kinds of purulent matter afforded interme- 

 diate quantities of melted matter between those just men- 

 tioned. 



C. The 



