When the more ordinary modes of investigation have failed in leading to the detection of an imposture, of whose existence we entertain but little doubt, we may proceed to a system of intimidation, and to severe discipline; few impostors, however sturdy, can withstand the cravings of hunger, blistering, the affusions of cold water, and above all a continual nausea from the administration of divided doses of _Tartarized Antimony_; and yet exceptions of an extraordinary kind might be adduced; “I have seen an instance,” says _Dr. Hennen_,[560] “where the patient admitted of all the preparatory measures of amputation before he thought proper to relax his knee joint;” the same author also relates the case of a dragoon who bore very severe riding-school duty for some weeks, secured to his horse, before he could be brought to acknowledge that his chronic rheumatism was assumed. _Mahon_[561] records a very extraordinary instance of a conscript, who feigned blindness, and baffled every attempt to detect the imposition; he was even placed on the margin of a river, and desired to go forward, which he did, and fell into the stream; he was however, without doubt, aware that boats were provided for his safety, for after having received his discharge, he freely acknowledged the imposition which he had practised. Having offered these general remarks, we shall proceed to consider the particular diseases more usually counterfeited, and the modes best calculated for their detection; although we must here observe, that after all that can be said upon the subject, each case will require an exertion of ingenuity for its detection, for which no previous instruction can ever provide. INSANITY has in all ages been feigned for the accomplishment of particular objects; we read of its having been thus simulated by David, Ulysses, and Lucius Brutus; the observations which we have already made upon the subject of imputed insanity, will suggest to the medical inquirer a plan of examination most likely to lead to a just conclusion. In general the detection of such an imposture will not be difficult; the feigned maniac never willingly looks his examiner in the face, and if his eye can be fixed, the changes in his countenance, on being accused, will be strongly indicative of his real state of mind; it is moreover, very difficult to imitate the habits of a lunatic for any length of time, and to forego sleep; an insane person generally sleeps but little, and talks much during the night, but the pretender, if he thinks he is not watched, will sleep, and only act his part when he believes his conduct to be observed.