drawing-room been placed in order in the gallery
of the old manor-house, than the former delusion returned in full force:
the green _figurantes_, whom the patient's depraved imagination had so
long associated with these moveables, came capering and frisking to
accompany them, exclaiming with great glee, as if the sufferer should
have been rejoiced to see them, "Here we all are--here we all are!" The
visionary, if I recollect right, was so much shocked at their
appearance, that he retired abroad, in despair that any part of Britain
could shelter him from the daily persecution of this domestic ballet.

There is reason to believe that such cases are numerous, and that they
may perhaps arise not only from the debility of stomach brought on by
excess in wine or spirits, which derangement often sensibly affects the
eyes and sense of sight, but also because the mind becomes habitually
predominated over by a train of fantastic visions, the consequence of
frequent intoxication; and is thus, like a dislocated joint, apt again
to go wrong, even when a different cause occasions the derangement.

It is easy to be supposed that habitual excitement by means of any other
intoxicating drug, as opium, or its various substitutes, must expose
those who practise the dangerous custom to the same inconvenience. Very
frequent use of the nitrous oxide which affects the senses so strongly,
and produces a short but singular state of ecstasy, would probably be
found to occasion this species of disorder. But there are many other
causes which medical men find attended with the same symptom, of
embodying before the eyes of a patient imaginary illusions which are
visible to no one else. This persecution of spectral deceptions is also
found to exist when no excesses of the patient can be alleged as the
cause, owing, doubtless, to a deranged state of the blood or nervous
system.

The learned and acute Dr. Ferriar of Manchester was the first who
brought before the English public the leading case, as it may be called,
in this department, namely, that of Mons. Nicolai, the celebrated
bookseller of Berlin. This gentleman was not a man merely of books, but
of letters, and had the moral courage to lay before the Philosophical
Society of Berlin an account of his own sufferings, from having been, by
disease, subjected to a series of spectral illusions. The leading
circumstances of this case may be stated very shortly, as it has been
repeatedly before the pub