fids 



ANALYSIS OF TOBACCO. 



dntim. After it luid been well washed, vfce treated it with 

 ak;obel, to t}i-,e up iill the green resin it coiitiiined J ai-d we 

 afterward subjecstd it to the action of weak nitrie acid, 

 which extracted from it various calcareous sat ts^ At first, 

 on saturati'wg tlvis acid by amrribnia, we obtained a floccu- 

 knt matter, which, when decomno&ed by sulphuric acid, 

 yielded an acid liquor, that precipitated lime water in large 

 fiocks, which oxalic acid does hot. However, as we sus- 

 pected the existence of oxalate of lime in this woody resi- 

 dunra, we cautiously evaporated a portion of the satue li- 

 quor, and obtained a few crystals of oxalic acid. 

 MiPtfewT nfse Phosphate oi' time may be pretty accurately separated 

 J^S^Km"^'^'*^™ "^^''^^'^^^ "^^'''*^^"'*'"^ ^^se, when they are dissolved ia 

 asataie of nitric acid, by addinj^ atunionia to the solution, so that a 

 slight exc-e-vn of acid shall remain. The oxalate of lime will 

 be precipitated for the most part in a pulverulent form, 

 while the phosphate of lime remains in solution ; and this 

 may be precipitated afterward by a larger 'quantity of am- 

 iwonia. 



The mother water of these crystals, evaporated to dr}'ness 

 &i^(l calcined, yielded us phosphoric acid. We also per- 

 ceived in the nitric solution traces of calcareous salt, which 

 we separated by evaporation of the liquor, and which we 

 fotrnd to be malate of lime. 

 w*x)d*^relixJue^ Tiius the nitric acid took up malate, phosphate, and ox- 

 alate of liiue, from the woody residuum. ' • 



Lastly the woody matter, after having been treated by 

 4l)ese different agents, left, when burned, some ashes, com- 

 posed chiefly of silex, with a little lime and iron.** 



Another prqcess for obtaining the acid principle contained in 

 tqbacco leaves, 



Anfitfier nrode Instead of precipitating by means of acetate of lead the 

 n\ obrummg j^^p^ ^^f tobacco coagulated by heat, as we have related 

 Piiie. iibove, the jnice'may be evaporated by a gentle heat, "andi 



when reduced to about one fourth, suffered to cool. It 

 will then deposite a pretty large quantity of malate of lime 

 in granular crystals, which will become opake by exposure 

 ty the air. On boiling down the solution still farther, it 

 wili yitld fresh quantities of the same salt ; and lastly, when 



it 



