This is, so to speak, a process of self-hypnotization, and I have often practiced it when going from house to house, when in the midst of a busy practice, and I sometimes have amused my friends and family by exercising this faculty, which I do not think it very difficult to acquire. (We also know that many persons can wake at a fixed hour in the morning by setting their minds upon it just 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.
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