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Nicotine, C10H14N2, a liquid volatile alkaloid, from 1.5 to 9 percent.

Essential oil, - according to Schlvesing, an important element in the flavor of tobacco, although its proportion is exceedingly small. Nicotianine, a solid camphor-like body to which the flavor of tobacco and the odor is principally due.

Malic and citric acids, together 10-14 percent, calculated as anhydrides.

Acetic acid, very little in fresh leaves, but increasing in their fermentation. In snuff it may use to 3 percent.

Oxalic acid, 1 to 2 percent.

Pectic acid, about 5 percent.

Resins, fats, and other bodies extractable by ether, 4 to 6 percent.

Sugar, little in the leaves, more in the stems; in the fermentation it disappears.

Cellulose, 7 to 8 percent.

Albuminoids, calculated from the nitrogen not present as nicotine, nitrates or ammonia, about twentyfive percent.