The realisation of these facts saves the physiologist from being deceived, either by fraudulent tricks or those natural chances of human occurrence which occasion the belief of the credulous in telepathy. He recognises that the human nervous system is built on a common plan, and that it is to be expected that the sensory stimuli received from a given environmental condition will often arouse the same train of thought in two or more people, standing together, especially in those who habitually associate. Such coincidences of thought, which astonish the ignorant, are due to natural law. Human experience shows that judgements of fundamental importance which would, if transmittable to another at a distance by telepathy, win a fortune, save a defeat, etc., are never so transmitted. The Stock Exchange and the army in the field must have their telephone and telegraph systems and messengers. No more concentrated will to send information, which might bring succour, say from the artillery, could be given than by men in peril of their lives in the trenches, when the enemy came swarming over the top, but we know that with the wires cut and the human messengers killed no succour came. Neither does it come to the liner which, in full proud course with its freight of thousands of souls strikes an iceberg, unless the wireless mechanism be installed and operated so that the S.O.S. signal is despatched. Otherwise it sinks without trace, as the Germans advised their 'U' boats to let their victim merchant ships sink. The phenomena of wireless telegraphy and of radio-active elements have led people to think that some direct means of communication of energy from one brain to another may be possible, that is without intervention of the special senses. There is not the least evidence in favour of this view; the evolution of the senses is wholly against it. It is true that all vital activity is accompanied by electrical change--by a flow of electrons--in the living matter, the nervous impulse itself may be so transmitted. Such electrical change by a special evolution of structure is magnified in the electric organ of certain fishes and used by them as a weapon of offence. It is then sensed just as an electric shock from a battery is sensed, and the intensity of the shock lessens inversely as the square of the distance. There is no evidence that the minute electrical changes accompanying nervous action in man are transmittable to a distance through space; the nerves are evolved to confine and convey these as nerve impulses to suitable receivers within their body whereby function is co-ordinated.