Section I. - Hallucinations in nightmare - Its analogy to madness - Varieties of nightmare - Its coexistence with reason and with insanity.

Section II. - Hallucinations in dreams - Analogy between dreams and hallucinations - Two divisions: physiological dreams, and pathological dreams - Psychological condition of dreams - Difference between hallucinations in dreams and those of waking hours - Hypnagogical hallucinations - Physiological studies - Coincidence of dreams with events - Presentiments - Facts in support thereof - Persistence of the intelligent principle in dreams - Pathological dreams - Influence of dominant ideas on dreams - Importance of dreams in the insane - Nocturnal epidemic hallucinations - Periodical hallucinations - They may become permanent - Recapitulation.