ANALYSIS OF BLACK VOMIT. 123 



the former phial, was of a yellow -colour : I'he colour- 

 ing-matter of which could be fo much difengaged,. 

 by wafhing it with water, as to give it the ufual tranf- 

 parency of ice. The aqueous part of the vomit, ob- 

 tained in this manner, diHolved foap, with facility, biit 

 had not the odour of the -vomit. This fluid was nei- 

 ther acid nor alkaline. Prufliate of pot-afh, or oxalic 

 acid, did not caufe any precipitation. 



(c) Some alcohol was poured on the adhefive refiduum 

 (a), and a coniiderable portion of it was difTolved, which 

 tinged the menftruum of a yellowifli-colour, and gave 

 to it the perceptible tafte of the yellow-coloured fluid. 

 A part of the refiduum remained infoluble, which ap- 

 peared to be of a mucilaginous nature. The menfl:ruuni 

 was poured off, and, by the affufion of diftilled water, 

 the fluid became milky, and a rei'mous fubfl:ance, of a 

 yellovvifh-colour, was precipitated, that had an odour 

 limilar to the yellow-coloured fluid. 



(^) The filtered fluid (No. i.) betrayed the pre fence of 

 an acid to the infufion of turnfole, as the mixture 

 became manifeuly reddened. 2. Lime-water, when 

 added to a portion of this fluid, occafioned no change : 

 3. Solution of fulphate of iron cauied no precipitation, 

 nor did nitrated mercury, or rauriated barytes. 



{f) To fome of the filtered fluid, 1 added nitrated 

 filver, and a copious white-coloured precipitate was 

 formed. Four drachms of the above fluid was eva- 

 porated over a moderate fire, unt;l it v.-as reduced to 

 about one drachm ; when fufl^ered to remain at refl:, in. 

 a cool place, cryftals, of a cubic figure, were formed. 

 I'hefe decrepitated upon coals, and had all the charadlers 

 of muriate of foda, or common fait. 



^ /') To feparate portions of the filtered fluid (No. i.) 

 was added oxalic acid, prufliate of pot-aih, infufion of 

 galls, and a folution of fulphate of copper ; but neither 

 of them produced any precipitation. 



ii) 



