Thought is conveyed without speech through the breath. The true wireless telegraphy is the rightly established current of breath. It is difficult for every man to try it, without practice in concentration and in absence of the development of breath, though unconsciously thoughts are always exchanged through the agency of breath. The scientist is ready to believe that contagious diseases are spread by means of breath, but it is the part of psychology to realize that thoughts and mental states -- such as humor, depression, energy, or sloth -- are conveyed by means of breath.