TOBACCO.

The active principle of tobacco is the alkaloid nicotine, but it cannot be said that the effects of tobacco are solely due to this substance, for some varieties, as the Syrian, etc., contains little or no nicotine, yet are considered strong. The quantity of nicotine varies much in tobacco, or from one-half of one per cent. to eight per cent. As a rule, the finer the quality and flavor, the less nicotine the tobacco contains.

There are many varieties of tobacco, as those of Virginia, Kentucky, Maryland, etc., which are used mainly for chewing, while the Cuban, Turkish, Connecticut, Sumatra, etc., are considered better for cigars. All these tobaccos may vary again in species, as, for instance, there are the Orinoco, Cienfuegos, White Stem, One Sucker, Isabella, White Barley, Fiji Orinoco, Cubani, and many others. Havana or Cuban tobacco has long held the palm over all the world for making the most exquisitely flavored cigars. The aromatic principles on which its value depends can only be developed under a warm, moist climate.