^6* 



ANALYSIS OF TOBACCO. 



'' 6. Acetate of lead formed a very copious grayish preci- 

 pitate, wliich dissolved in great part in distilled vinefjar. 

 ^^'.^JS'lchii ■1*'''* e^^<^t of acetate of lead on this juice inducing ua 

 .: ... to isWpect the presence of malic acid, we precipitated by 

 rnfeans' of acmafe of lead ' a pi-etty large quantity of the 

 Kquoi' coagiifated by heiat ; and afterward passed through 

 this precipitate washed and diffused in Nvater a stream of 

 fi^dlphuvctted hidrogen gas, till there was a slight excess 

 of it. 

 , , f_ '^'*rhe intention of this was to reduce the lead to a sul- 

 phtiref, atid thuS separate it from the matter with which 

 it ha:d been united. To facilitate the precipitation of the 

 fetyfphnretted lead, we heated the liquor, and filtered. 



The liquor thus filtered was cautiously evaporated to the 

 *" — ^oWsisteh^e of a sirup. In this state it had a very acid taste, 

 strdftglV" reddened infusion of litmus, aiid formed with al- 

 cohol'^aWd ammonia copious sediments, whicli, while they 

 Animal mat- indt«'ate<il the presence of animal inatter, proved, that a 

 portion of it had been carried down with the lead in its 

 precipitation. -•■> >,'^ -; ■ 



The acid diss- .'i Ijopifig that th^'aeid-<SOflt!iiihed )n this thickened liquor 

 would" prove soluble in spirit of wine, and that we might 

 thus separate it from the matter it held in solution, we 

 treated it hot with this menstruum at 40° [sp. gr. G-817]. 

 lu fact, as soon as the mixture of these two liquors took 

 place, a copious coagulatian Was produced, and the alcohol 

 beeahit <j6l<)ilred, hist yellowish, then brown red, and was 

 found to be acid. 



The matter not dissolved by the spirit of wine was whitish, 

 partly dissolved in water, and its solution was precipitated 

 by the acetate of lead like the acid itself. 



Oxalate of ammonia occasioned in it a precipitate, and 

 this substance, placed on burning charcoal, left a residuum 

 of carbonate of lime. Lastly, we found, that this sub- 

 stance was farmed in gnat part of ipiilate of lime, which 

 retained some portions of vegeto-ajiimal matter. - 

 Ti.e animal The gfea^ter part of this vegeto-animal matter, which we 



matter strong- ^^^ endeavoured to separate by means of alcohol, having 

 ihf ^ctd. Uissulyediu it by the help of the acid, we saturated the 



latter with aoimonia, which threw down a considerable 



flocculent 



t^r. 



solved 111 alco- 

 hol. 



