eat visionaries, were they correctly detailed, would probably prove
how their delusions consisted of the ocular _spectra_ of their brain and
the accelerated sensations of their nerves. BAYLE has conjured up an
amusing theory of apparitions, to show that HOBBES, who was subject to
occasional terrors, might fear that a certain combination of atoms
agitating his brain might so disorder his mind as to expose him to
spectral visions; and so being very timid, and distrusting his own
imagination, he was averse at times to be left alone. Apparitions often
happen in dreams, but they may happen to a man when awake, for reading and
hearing of them would revive their images, and these images might play
even an incredulous philosopher some unlucky trick.

[Footnote A: CHARLES BUTLER has drawn up a sensible essay on "Mystical
Devotion." He was a Roman Catholic. NORRIS, and Dr. HENRY MORE, and Bishop
BERKELEY, may be consulted by the curious.]

But men of genius whose enthusiasm has not been past recovery, have
experienced this extraordinary state of the mind, in those exhaustions of
study to which they unquestionably are subject. 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. They have
insulated the mind. With them ideas have become realities, and suspicions
certainties; while events have been noted down as seen and heard, which in
truth had never occurred. ROUSSEAU'S phantoms scarcely ever quitted him
for a day. BARRY imagined that he was invisibly persecuted by the Royal
Academy, who had even spirited up a gang of housebreakers. The vivid
memoirs of ALFIERI w