When the secondary sensory elements come to the foreground and stand out clearly in consciousness, a full-fledged hallucination arises. In the phenomena of synaesthesia we have hallucinations in the simplest form, inasmuch as only isolated secondary sensory elements dissociated from their active primary central elements stand out in the foreground of consciousness. This very simplification, however, of hallucinations reveals their inner character. The most complex hallucinations are only complex compounds, so to say, of secondary sensory elements. Hallucinations are not anything mysterious, different from what we find in the normal ordinary processes of perception; they are of the same character and have the same elements in their constitution as those of perception. Both hallucinations and percepts have the same secondary as well as primary elements. The difference between hallucinations and percepts is only one of relationship, of rearrangement of elements, primary and secondary. When _secondary sensory elements become under conditions of dissociation dynamically active in the focus of consciousness we have hallucinations_. From this standpoint we can well understand why a hallucination, like a percept, has all the attributes of external reality. A hallucination is not any more mysterious and wonderful than a percept is. We do not recognize the humdrum percept, when it appears in the guise of a hallucination, and we regard it as some strange visitant coming from a central, or from some supersensory universe. Hallucinations, like percepts, are constituted of primary and especially of secondary sensory elements, and like percepts, hallucinations too are induced peripherally. How is it with suggested[13] or hypnotic hallucinations? Do we find in hypnotic or suggested hallucinations, as in the case of hallucinations in general, the requisite primary and secondary sensory elements directly and indirectly induced? Binet makes an attempt to establish a peripheral stimulus in the case of hypnotic hallucinations, claiming that there is a _point de repére_, a kind of a peg, on which the hypnotic hallucination is hung. It is questionable whether Binet himself continued to maintain this position. However the case may be, this position is hardly tenable when confronted with facts. Hypnotic hallucinations may develop without any peg and prop.