The group of suggestive effects which we reach next in order is a wide and important one. The education of the _central sensory faculties_,--of our power of inwardly representing to ourselves sights and sounds, etc.,--is not less important than the education of the external senses. The powers of construction and combination which our central organs possess differ more widely in degree in different healthy individuals than the degrees of external perception itself. And the stimulating influence of hypnotism on _imagination_ is perhaps the most conspicuous phenomenon which the whole subject offers; yet it has been little dwelt upon, save from one quite superficial point of view. Every one knows that a hypnotised subject is easily hallucinated;--that if he is told to see a non-existent dog, he sees a dog,--that if he is told _not_ to see Mr. A., he sees everything in the room, Mr. A. excepted. Common and conspicuous, I say, as this experiment is, even the scientific observer has too often dealt with it with the shallowness of the platform lecturer. The lecturer represents this induced hallucinability simply as an odd illustration of his own power over the subject. "I tell him to forget his name, and he forgets his name; I tell him that he has a baby on his lap, and he sees and feels and dandles it." At the best, such a hallucination is quoted as an instance of "mono-ideism." But the real kernel of the phenomenon is not the inhibition but the dynamogeny;--not the abstraction of attention or imagination from other topics, but the increased power which imagination gains under suggestion;--the development of faculty, useless, if you will, in that special form of imagining the baby, but faculty mentally of a high order--faculty in one shape or another essential to the production of almost all the most admired forms of human achievement. On this theme I shall have much to say; yet here again it will be convenient to defer fuller discussion until I review what I have termed "sensory automatism" in a more general way. We shall then see that this quickened imaginative faculty is not educed by hypnosis alone; that it is a part of the equipment of the subliminal self, and will be better treated at length in connection with other spontaneous manifestations. Enough here to have pointed out the main fact; for when pointed out it can hardly be disputed, although its significance for the true comprehension of hypnotic phenomena has been too often overlooked. Yet here, and in direct connection with hypnotism, certain special features of hallucinations need to be insisted upon, both as partly explaining certain more advanced hypnotic phenomena, and also as suggesting lines of important experiment. The first point is this.