While our knowledge and mastery of the planet we possess, and of its forces, are being steadily advanced by scientific discovery, and the researches of the pure scientist are constantly yielding practical results at first undreamed of, it is impossible to doubt that man's knowledge of himself will make equal progress. And it is not alone the physical constitution of man that will be interrogated. Everything assists the belief that this century will be among other things the century of psychical advance. We appear to be on the verge of great discoveries concerning the human mind, and especially concerning the relation of body to consciousness. Hypnotism has only during a comparatively short time been the subject of systematic observation, even in France; but at any time during the last ten years results have been achieved which, if foreseen a century ago, would certainly have produced a widespread recrudescence of belief in witchcraft. What the developed science of a hundred years hence will be capable of would certainly be a great deal more surprising if we could foresee it to-day. It is reported from the Salpetrière Hospital that a woman, under hypnosis, has had the existence of a picture on a blank sheet of paper suggested to her with such vividness that, on the suggestion being revived at a subsequent period, even after a considerable interval, she was able to detect that the "picture" was upside down, the blank paper having been actually reversed. This phenomenon is attributed to a great accentuation of the sense of vision produced by hypnotism, it being supposed that the paper, perfectly blank on ordinary observation, had really some local irregularity of colour or surface which the sharpened vision of the subject was able, unconsciously, to utilise. What secrets in the mechanism of the senses may not this fore-shadow? Without any recourse to hypnotism, as we at present understand hypnotism, impressions have, in a number of instances sufficient to exclude all possibility of collusion or error, been conveyed from one mind to another without the use of any of the ordinary means of communication: and it is shown in experiments seriously conducted by trained observers that the faculties of thus communicating and receiving impressions can be steadily cultivated. In other words, it would appear that human consciousness possesses some sort of emanation, and although certain "ray" experiments possibly connected with the subject have not received universal acceptance, it is evident that the future is going to enlarge considerably our knowledge of the nature of mental process. At present we know nothing--and it has been said with some rashness that we must always remain in a like ignorance--of the interval between sense and consciousness. We know how the ear receives air-vibrations, how it collects and conducts them to the auditory nerves, carefully protecting itself, by the action of beautifully ordered springs and cushions,