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 And this must be said in favour of admixtures—that by smoking several kinds of tobacco in combination the student approximates more nearly to the universal energy than if he smoke one kind alone, for it is to be considered that each sort has its peculiar excellences and its peculiar defects, whence by mixing several sorts in such a proportion that the excellences are combined in a harmony and the defects or vices annulled, we are near to that ideal tobacco possessing every conceivable excellence and no conceivable vice.

So much, then, for the various kinds of Tobacco, the properties thereof, and the combinations thereof. Now Smalgruelius, in the Appendix to his work De Omnibus Rebus, entitled De Quibusdem [sic] Aliis, at the beginning of the chapter De Rebus Hypotheticis, has these words:—"Anything which can be applied to some use, and, on being so applied, is incapable of being used again, is said to exist in three modes, namely—I. Privation. II. Position. III. Negation. Exempli