J^NALYSIS OF TOBACCO. ^^5 



jpbund al*oJn prepared tobacco, as we ^hall show in another 

 pa|>er, is not altered by the dliFerent operations it undergoes ; 

 and consequently is not produced by pny change in ihe con- 

 stitution of the myterials of the plant. 



. "^rhe following are the substance* we ^ave thu& far found Substances 



- ^1 • ■ r. i. L found iu the 



jn the juice ot tobacco: j^^j^^^ 



V. 1» An animal naatter: 



% Malate of lime with excess of acid : 



:?» Nitrate of potash: 



4, Muriate of potash : 



5, A peculiar acrid principle. 



: ^ow we know these different substances contained in the 

 Jqice of tobacco coagulated and hltered, we shall point out 

 |he results of the successive experiments made on the green 

 fecula, on the coagulum obtained during the boiling of the 

 juice, and on the woody residue. 



The green matter obtained by filtering tobacco juice, be- ^•^^'"'"^-"^'^ 

 ing treated with alcohol, left as an insoluble residuum af^cuia- 

 grayish substance, tolerably compact, yielding on distillar 

 tipn a gri^at deal of carbonate of ammonia, partly crystalli- 

 zed and partly dissolved in water, a thick fetid oil, and a 

 coal of difficult incineration, which yielded a little lime, 

 proce«;ding no doubt from a portion of decomposed malate. 

 It appears, that this matter is a portion of insoluble vegeta- 

 ble albumen^ As to the colouring portion of the fecula dis- 

 solved by alcohol, it differed in no respect from the green 

 f^^cula of vegetables. 



We have said, that a pretty considerable coagulum was of the matter 

 forrtved on. boilin th fi . r d nice. This coagulum isboifni;^'^ ^ 

 an albuminous vegeto-animal substance; for it emits the 

 same smell as horn when burninc^, and yields a great deal 

 of ammonia ; but it is remarkable, that it leaves a great 

 deal of liuie after it is burned. 



To find whence this earth could be derived, we treated a 

 portion of this animal matter with muriatic acid very much 

 diluted. The solution, filtered and saturated with ammo- 

 nia, yielded by cautious evaporation a granular powder, 

 which was also malate of lime. What had not dissolved in 

 the muriatic acid was pure vegeto-animal matter. 



3oniethins remains to be said respecting the woody resi- andoftli* 



® ^ ° • wood V residue. 



duum. 



