Section I. - Simple isolated hallucinations - Their action on the mind - Profound conviction of the hallucinated - Loss of the senses no obstacle to hallucinations - Cases; - Of hallucination of hearing by deaf persons - Hallucinations, internal and external, isolated or combined - Hallucination of the sight - Visions - Visionaries - Belief in apparitions - These hallucinations vary like those of hearing - Hallucinations in weakness or loss of sight - The hallucinated believe they can see inside their bodies, a power analogous to that possessed by persons magnetized - Hallucinations of sight and hearing combined - Hallucination of the touch - Difficulties of diagnosis - Certain tactile hallucinations referable to hypochondriacal illusions - Hallucinations of smell and taste, as rare as the preceding - Hallucinations rarely unconnected with one of the forms of insanity - Very common in madness and several other diseases - Recapitulation.