before going to sleep.) Now, there is something here which deserves a little further examination, but which it would take too much time to develop fully at present. Most people know something of what is meant by reflex action. The nerves which pass from the various organs to the brain convey with, great rapidity messages to its various parts, which are answered by reflected waves of impulse. If the soles of the feet be tickled, contraction of the toes, or involuntary laughter, will be excited, or perhaps only a shuddering and skin contraction, known as goose-skin. The irritation of the nerve-end in the skin has carried a message to the involuntary or voluntary ganglia of the brain which has responded by reflecting back again nerve impulses which have contracted the muscles of the feet or skin muscles, or have given rise to associated ideas and explosion of laughter. In the same way, if during sleep heat be applied to the soles of the feet, dreams of walking over hot surfaces—Vesuvius or Fusiyama, or still hotter places—may be produced, or dreams of adventure on frozen surfaces or in arctic regions may be created by applying ice to the feet of the sleeper. “Here, then, it is seen that we have a mechanism in the body, known to physiologists as the ideo-motor, or sensory motor system of nerves, which can produce, without the consciousness of the individual and automatically, a series of muscular contractions. And remember that the coats of the arteries are muscular and contractile under the influence of external stimuli, acting without the help of the consciousness, or when the consciousness is in abeyance. I will give another example of this, which completes the chain of phenomena in the natural brain and the natural body I wish to bring under notice in explanation of the true as distinguished from the false, or falsely interpreted, phenomena of hypnotism, mesmerism and electro-biology. I will take the excellent illustration quoted by Dr. B. W. Carpenter in his old-time, but valuable, book on ‘The Physiology of the Brain.’ When a hungry man sees food, or when, let us say, a hungry boy looks into a cookshop, he becomes aware of a watering of the mouth and a gnawing sensation at the stomach. What does this mean? It means that the mental impression made upon him by the welcome and appetizing spectacle has caused a secretion of saliva and of gastric juice; that is to say, the brain has, through the ideo-motor set of nerves, sent a message which has dilated the vessels around the salivary and gastric glands, increased the flow of blood through them and quickened their secretion. Here we have, then, a purely subjective mental activity acting through a mechanism of which the boy is quite ignorant, and which he is unable to control, and producing that action on the vessels of dilation or contraction which, as we have seen, is the essential condition of brain activity and the evolution of thought, and is related to the quickening or the abolition