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 more, since the clouds arising from Cavendish and the Turkish tobacco are exactly the same in appearance, it follows that nausea is no more likely to result from the use of the one than the other, which is to say that they are both of an equal strength. But this, as any one of my readers can ascertain for himself, is a falsity, Cavendish tobacco being, at the least, double the strength of Turkish tobacco. Hence, since the proposition, "All sensations experienced in smoking are due to the sight of the smoke," has been proved to be false, its contradictory must be true—that is, "Some sensations experienced in smoking are not due to the sight of the smoke."

And this being established on the firm ground of logical inference, I will at once grant that smoking in darkness is a most unsatisfactory and incomplete process, affording very little pleasure at the best of times, and frequently none at all. And the reason is this—namely, "Some sensations experienced in smoking are due to the sight of the smoke," which I account