"You send an electric current through a thick wire. You have the current, but you do not perceive any other force. But cut that thick wire, and connect the ends by means of a fine wire, and this fine wire will grow hot--there will be a TRANSFORMATION of a part of the current into HEAT. Take a pretty strong current, and interpose a wire still more resistant, or a very thin carbon rod, and the carbon will emit LIGHT. A part of the current, then, is transformed into heat and light. The light acts in every direction around about, first visibly as light, then invisibly as heat and electric current. Hold a magnet near it. If the magnet is weak and movable, in the form of a magnetic needle, the beam of light will cause it to deviate; if it is strong and immovable, it will in turn cause the beam of light to deviate. AND ALL THIS FROM A DISTANCE, WITHOUT CONTACT, WITHOUT SPECIAL CONDUCTORS. Dynamic Correlate of Thought. "A process that is at once chemical, physical and psychical, goes on in the brain. A complex action of this kind is propagated through the gray brain matter, as waves are propagated in water. Regarded on its physiological side, an idea is only a vibration, a vibration that is propagated, yet which does not pass out of the medium in which it can exist as such. It is propagated only as far as other vibrations allow. It is propagated more widely if it assumes the character which subjectively we call emotive. But it cannot go beyond without being transformed. Nevertheless, like force in general, it cannot remain in isolation, and it escapes in disguise. "Thought stays at home, as the chemical action of a battery remains in the battery; it is represented by its dynamic correlate, called in the case of the battery a 'current,' and in the case of the brain, I know not what; but whatever its name may be, it is THE DYNAMIC CORRELATE OF THOUGHT. I have chosen the name 'dynamic correlate.' There is something more than that; the universe is neither dead nor void. "A force that is transmitted meets other forces, and if it is transformed only little by little it usually limits itself to modifying another force at its own cost, though without suffering materially thereby. This is the case particularly with forces that are persistent, concentrated, well seconded by their medium. It is the case with the physiological equilibrium, nervic force, psychic force, ideas, emotions, tendencies. These modify environing forces, without themselves disappearing. They are imperceptibly transformed, AND IF THE NEXT MAN IS OF A NATURE EXCEPTIONALLY WELL ADAPTED TO THEM, THEY GAIN IN INDUCTIVE ACTION." Answer to Skeptical Critics