Tissot, on "The Health of Men of Letters," has produced a terrifying number of cases.

They see and hear what none but themselves do.

Genius thrown into this peculiar state has produced some noble effusions.

KOTZEBUE was once absorbed in hypochondriacal melancholy, and appears to have meditated on self-destruction; but it happened that he preserved his habit of dramatic composition, and produced one of his most energetic dramas--that of "Misanthropy and Repentance." He tells us that he had never experienced such a rapid flow of thoughts and images, and he believed, what a physiological history would perhaps show, that there are some maladies, those of the brain and the nerves, which actually stretch the powers of the mind beyond their usual reach.

It is the more vivid world of ideal existence.
But what is more evident, men of the finest genius have experienced these hallucinations in society acting on their moral habits.