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The Anatomy of Tobacco
proper that it should be reasonably anatomised and divided; and the division commonly in vogue is that into four kinds—namely (1) necessary matter; (2) contingent necessary matter; (3) contingent unnecessary matter; (4) impossible matter. And the meaning of these terms is as follows:—
| (1) | Necessary matter is that without which the act of smoking is impossible. |
| (2) | Contingent necessary matter is that which, although not absolutely necessary to the act of smoking, is seldom wanting. |
| (3) | Contingent unnecessary matter comprehends such things as convenient in smoking, but are wholly unnecessary. |
| (4) | Impossible matter is that of which it is possible to inhale the fumes through a pipe; but since it is not tobacco, the inhaling of its fumes is not smoking, and with it it is impossible to smoke. |
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