Persecution and its prohibitions have also been most powerful in working upon our imagination. Rare and forbidden fruits will always be considered more desirable than those we can easily obtain. The history of tobacco is a striking instance of this influence of difficulty upon the mind of man. Pope Urban VIII. prohibited its use in any shape, under the penalty of excommunication. It was afterwards forbidden in Russia, under the pain of having the offender's nose cut off. In some cantons of Switzerland the prohibition was introduced in the decalogue, next to the commandment against adultery. Amurath IV. ordered all persons taken in _flagranti delicto_ smoking tobacco, to be impaled, on the principle that its use checked the progress of population. The denunciation of our James I. may be considered as a masterpiece of the imaginary horrors attributed to this obnoxious weed. "It is," he says, "a custome loathsome to the eye, hatefull to the nose, harmefull to the braine, dangerous to the lungs, and in the black stinking fume thereof neerest resembling the horrible Stygian smoake of the pit that is bottomlesse." During the reign of this monarch such a restriction might have been necessary, unless the consumption of tobacco enriched the exchequer: for it appears that some _amateurs_ consumed no less than L500 per annum in smoke. Surely we should reap some flourishing revenue from fashion and credulity, when we find our government awarding L5000 to a _certain_ Johanna Stephens for her discovery of _certain_ medicines for the cure of _calculi_! The same imaginary hope induced many a credulous creature to minister to the necessities of another Johanna, for _certain_ expectations. Alas! how this indefinite _sense_ exhibits the infinite folly of poor humanity! A morbid imagination, although frequently the source of much misery, will prove in many cases the fountain-head of many noble qualities; its exaltation constitutes genius, which is, in fact, a natural disposition of individual organization sometimes bordering upon insanity. "_Non est magnum ingenium sine mixtura dementiae_," says Seneca; and Montaigne observes, "De quoi se fait la plus subtile folie que de la plus subtile sagesse? il n'y a qu'un demi-tour a passer de l'une a l'autre." Aristotle asserts that all the great men of his time were melancholy and hypochondriac. The ancient and eastern nations entertained a singular idea regarding men of innate genius, and possessed of more than common attributes; they fancied that they were the first-born, and the offsprings of illicit love: Zoroaster, Confucius, Mahomet, Vishnou, were born of virgins; and Theseus, Hercules, Castor and Pollux, and Romulus, were all illegitimate.