Along with the inner process the outward form of the hallucination still requires a brief explanation. The circumstance, namely, which lends magic-mirror phenomena their salient feature, is the sensory reproduction of the images that have sprung up from the subconsciousness. The subterranean ideas produced do not reach the surface as thoughts, but as pseudo-perceptions. To refer the latter to the place to which they belong, I shall first remind the reader of the well-known after-images which arise when an excitation produced in the sensory organ and in the sensory nerves does not immediately disappear with the cessation of the excitatory action. By gazing at the sun we can at once obtain this effect. But despite the fact that the last-mentioned class of images possesses the full distinctness of real sensations as distinguished from mere memory and imagination images, they still bear no relation to our subject on account of their union with _recently_ occurring sensory impressions. Still less do the repetition-sensations in the dark field of vision—as of revolving wheels—belong here; or illusions. There remain accordingly only _hallucinations_, which are withdrawn from all conscious control, and which possess the exact character of sensory perceptions externally awakened, without any object or objective stimulation actually being present in the outer world to correspond to them. Hallucinations, the production of which are facilitated by the fixation of shining surfaces, do not occur with all persons; and there may be a kernel of truth in the tradition which designates women and children as endowed with especial capacities in this respect. The investigations of Fechner upon the varying vividness of after-images; the statistics of Galton upon hallucinatory phantasms in artists; and the extensive statistical work of the Society for Psychical Research, appear to point to a connection of this character. Miss Goodrich told me that her dreams were few in number and colorless. I must confess that I was surprised at this; but she added that all her recollections of places were accompanied with the vividness of actual sensory impressions. If, for example, she desires to describe a room in a friend's house, she returns in recollection to the occasion of her last visit; she again occupies the same chair; the carpet at her feet becomes visible, then the furniture nearest her, then the walls and ceiling, until a true picture of the whole room is extended before her mind's eye. Crystal-visions are distinguished from internal visions of this character only by the single circumstance that they are projected outwards to or upon a reflecting point. These visions often consist of a room that Miss Goodrich has lately seen, or a street sign, or of some movement that has startled her, as of a servant letting a plate fall, or of a dog running under a wagon. No consideration that the objects are not before her is of avail; the force of out-rushing