ANALYSIS OF BLACK VOMIT. 121 



(r) Lime-water produced no clouds or turbidnefs. 

 [J) Solution of fulphate of iron, or nitrated mercury, 



caufed no precipitation. 

 [e) Muriated barytes occafioned no alteration ; 

 (/) Nitrated filver produced a copious white pre- 

 cipitate ; 

 (^) Sulphate of copper did not fhow the prefence of 



ammoniac ; 

 (/6) Fixed alkalies occafioned no alteration ; 

 (i) Oxalic acid produced no change ; 

 [k) Alcohol of galls, or prufliate of pot-afh, did not 



produce any precipitation. 

 (/) Thefe fluids, when expofed to cold, were congeal- 

 ed in the temperature in which water freezes; the ice 

 was nearly tranfparent, and, when rendered fluid, 

 had the appearance of water, and tailed like that 

 fluid after being boiled. 

 The above fluid, therefore, appears to contain an acid 

 in a free fl;ate {a); but no coagulable matter {I?), nor 

 carbonic acid, in a difengaged ftate, or combined with 

 alkalies or earths (r & ^) ; the acid (a) is proved not 

 to be the fulphuric [e). The prefence of the muriatic acid 

 is fuppofed, from {/" ) ; no ammoniac is contained in this 

 fluid (^), nor earths (/6), nor lime, or the falts formed of 

 lime and acids (/') ; no reafon to fufpedl metallic matter 

 [k) ; but a conliderable proportion of water (/). 



Analyjis of black vomit. 



We have already obferved, in the defcription of the 

 black vomit, that it fpontaneoufly feparated into yellow- 

 coloured fluid, and black flaky fubftance. 



(No. 1.). The yellow-coloured fluid, and flaky 

 fubftance being thrown on a filter of two-folds of pa- 

 per, four ounces of a fluid pafl^ed through, which was 

 fimilar, in appearance, to an infufion cf green -tea. It 



was 



