n 



2d solution. 



dd solution. 



4th solutioa. 



OBSERVATIONS AND EXPERIMENTS ON PUS. 



forming an upper stratum to the pus. It was decanted for 

 examination. 



(a) On exposure to fire it became turbid like milk, as 

 soon as tlie temperature wa.s elevated to li)5°, but did not 

 become thicker at a greater elevation. 



(b) On evaporation to dryness, the residue amounted to 

 about one fifteenth of the weight of the liauid from the se- 

 rous pus, and to one twentieth from the three other kinds; 

 in place of about one tenth, as from the first decanted li- 

 quid, (Sect. I, 4) ; and as from serum of blood. The resi^ 

 duary matters were of the same kiiid as those above de- 

 scribed, Sect. II, 2—6. 



(c) Three ounces by measure of distillfd 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 [h). These de- 

 canted fluids became nearly as turbid as the former, on 

 raising their temperature to l65°. 



{d) Distilled water was added a third time, in the quan- 

 tity of eight ounces by measure, to ein h of the lour parcels 

 of pus under examination; and, after 48 [.ours repose, six 

 ounces of limpid fluid were poured off iVom each of them. 

 At the temperatureof l65°, the decanted fluids became tur- 

 bid ; that of the serous pus more ro than the others. On 

 evaporation to dryness, a much smaller quantity of residue 

 was obtained than before, viz. one sixtieth from the serous 

 pus, and one seventieth from the others; and it consisted 

 of the same kind of substances as above described ; but the 

 muriate of soda and potash were in smaller proportion thqn 

 before, 



(e). A fourth time distilled water, in the quantity of a 

 pint, was mixed with the present four parcels of pus; and, 

 after standing 48 hours, three fourths of a pint of clear 

 colourless liquid was poured off from each of them. It 

 became slightly turbid and whitish on boiling. On eva- 

 poration, each parcel afforded about gV o^ t'^*" fimd em- 

 ployed. The residues now consisted of animal matter, with 

 a miach smaller proportion than before of muriate of soda, 



phosphate 



