^60 ANAI.1^S|^QF T^Bui^CO. 



i(. That we may imagine so many more compounds con- 

 taiQitig the same elements in the same quantities, as we can 

 coaeeive the binary combinations, forn>ed by the elements 

 of these compounds, to be more numerous. 



^omiSindil* ^* '^^^^ *"'*^' ^^ ^^^^^ compounds, being neutral, though 

 cate the capa- formed of an acid containing an excess of oxigen, and abasje 



city of com- tihat )s st»U Combustible; y»e may admit, that the base sa- 

 bustibles for ^ , . . ^ •', . , , , , 



oxigen. furftt^s tiae excess ot oxigen of the acid ; artd that hence 



results a point of saturation, well adapted to determine the 



capacity of combustibles for oxigen. For instance, the 



neutral -gitrate of arninpnia, being decomposed by heat, 



yields as products water, which is neutral, and gaseous oxide 



of nitrogen, which must be neutral also. 



DensHy of rvi- 7. That nitrous gas and oxigen gas, in combining to pro- 

 trous acid gasi. , . ., . , 1 .• 



" duce nitrous acfd gas, experience an apparent condensation 



of bulk, which is precisely half the total bulk of the two 



gasses, whence it follows, that the density of nitrous acid 



I0 the i !.r '^ni'is '2',J0lS3^i that of atmospheric air bieing U 



-Qj r[:.'-c r- qi'iv ' " ' r. '' f ^ii ■ , , .,,. ■ ■ , , . .-^ 



...2i.i ' ■; ■ '■ ■ VI. 



le. 



^oiin'M:e\l^^^fitj^£/f)yjarge4ettved Tobacco, Nicotiana tabacnm lati" 

 w%'in- '' folia and avgustif alia : % iJfr. Vauquelin*. ' '* 



\-'*n: '!.--'■' ~^__^ ■''■ ' ■ - -■:.? 



Tobacc&pfo- * JL ifbtJGiH there can be no doubt, that the various tne* 

 uecuHarprln^- ^^^o''^ employed for preparing tobacco modify, each in its 

 bVvii way, Some of the principles contained in this plant, 

 yet the changes) experienced by these principles cannot en- 

 tiiely destroy their peculiar properties; otherwise, it is evi- 

 i^etit,' that tobacco might be made from a great number of 

 herbaceous plants, which is not the case. Reason therefore 

 leads us to conclude, that there exists in the nicotiana at 

 least one substance, notto be found in the other plants, froi^ 

 whlcH iiti^nctpts have been inade to manufacture tobacco ih 



Analysis uii. The^e considerations have led us to undertake a earieful 

 ch'^micul analysis of the different species of nicotiana em- 



,.- \ ■■:■■■■: :t CTi'lZ . _' . 



* Ann, fie Chin., voK LXXJ, p. 139. 



r*^l i ployed 



ieriaken. 



