All dreams originate from former sensations. These sensations were introduced into the mind by the senses, at some previous time or times, and the mind has stored them away where they have lain dormant and forgotten. The dream-state is that condition of temporary subconsciousness when the memory recalls the aforesaid sensations and submits them to the scrutiny of the reasoning faculty, by which their relations are determined, through the agency of association. During perfect sleep there can be no dream, because the dream is caused by a state of activity of certain faculties, which, in perfect sleep, are in a state of torpor. There could be no dream if the mental faculties, including memory, are at perfect rest. Only when part of the mental faculties are sufficiently active to recall the sensations and impressions that are stored away, and to institute association, can there be dreams. Some of the faculties must be active, and some inactive, to produce a dream, and only in imperfect sleep does this condition obtain. Among the inactive faculties in the dream state is judgment, which, were it active, would correct the mental process and discover the fallacy. Imagination is often brought strongly into play by the dreamer; and the combination of imagination, previous sensations and associations often create fantastic objects and pictures wholly different from those occurring in nature. The mind of the dreamer can readily combine parts of the sensations previously derived from beholding an elephant, a crow and a cow, and may see in his dream a crow with a trunk, a cow with a bill, or an elephant with upright horns and a black feathered tail. It can also readily associate with his own self parts of various sensations derived from reading or hearing of certain crimes or improprieties, and picture himself in the act of doing things utterly at variance with his morals and inclinations when in a conscious state. It also may happen, in the various modes of combination, that objects or events are portrayed in accordance with nature and facts, but, perhaps, in exaggerated, diminished or distorted forms, in which case an erroneous standard of judgment is formed that will throw all after sensations out of perspective with truth.