forms is a living issue which every physician has to meet. The proposition that "all disease is mental" seems so absurd to the medically trained man, that he is apt to ignore the fact that some disease is mental. It is admitted that the profession has been engrossed with the physical side, discovering the principles of hygiene, aseptic surgery, antitoxin, scientific medicine, etc. It has not given attention to the psychic side, but there is evident an increased interest, and a few medical schools have established chairs in psychotherapeutics. COPLEY SQUARE, BOSTON, January, 1907. D. W. W. Contents PAGE CHAPTER I REASON AND INSTINCT Books recommended: James," Psychology," Henry Holt; Habit. CHAPTER II HABIT 1-15 Human instincts are transient unless developed into habits. "As the twig is bent the tree inclines." Habits are reflex arcs, which like electric currents follow the path of least resistance. - The development of habThe moral significance. "Man is a mere bundle of habits.". -The concatenated impulse; economic value. Professional habits. Intelligent reading is wise skipping. The conscious and subconscious; relationship. — The "Moment Consciousness." Sleep a dissociation of few or many nerve centers. - Dreams are sleeping hallucinations; duration short. - Caused by some centripetal - Infinite resources of the stimulus, somatic or external. subconscious. - Wonderful memory; how to utilize it. · A possible explanation of genius. — Geniuses not well balanced. Mental epidemics. - Concentration in the crowd but not of it PAGE 16-34 CHAPTER III - Sensation. Evolution of the special senses. - Doctrine of relativity: noumenon, phenomenon. Limitations of sense perception. - The threshold. The greatness and littleness of human intellect. - Special senses, a refinement of tactile sense. - The outward reference of sensation. The correlation of the senses. Visual perceptions. The inverted retinal image, current explanation of erect vision: tactile experience reinverts visual sensation; incorrect, because not analogous to other special - First sight of congenitally blind is always erect. - Mr. Hanna's experience. Man ignorant of retinal image. Each mathematical point of object is referred back to its proper place, and we see not the retinal image, but the object itself in space The blind spots; the two optic discs.- Retinal shadows: erect, because cast by objects too near the eye to form image on retina; outward projection of, produces inverted image. Outward reference of tactile sense; flexible without parallax. Law of corresponding points. — Each ganglion cell two neurons, divide for both retina. — Orientation, with prism. — Diplopia: -physiological at distances farther or nearer than point fixed. Analogy of digital tactile sense.. - Binocular estimation of distance. – Fusing successive double images. — Coördination of convergence and accommodation. - Stereoscopic perspective. - Pictures correspond to right and left retinal images. Convergence required to fuse, determines distance; convergence excessive, nearness; convergence slight, distance.- May overcome mathematical perspective. - Binocular vision an acquired faculty.-Fusion training. The amblyoscope. Phoro-optometer stereo xi PAGE 55-65 CHAPTER V HYPNOSIS-HISTORICAL Hypnotism. Historical. Neuro - hypnotism. sleep, so called by Braid, 1843. — Phenomena are as old |