Second, that particles smaller than atoms, called corpuscles or ions, are thrown off with high velocity from the intensely heated bodies. The sun, they claim, being such a body, it follows that such ions must be shot out from it. On this theory it is held that the explanation of a comet's tail is simple. The comet evaporates on the side next to the sun and, there being no pressure to hinder its expansion, it begins in flying off in all directions. It condenses into very minute particles which, by reason of the impulsion or pressure of the sun's rays, are thrown in the opposite direction from the sun. My explanation has been, without all this detail, that it was the same law of electric repulsion which drove the comet off and prevented it falling into the sun, which also drove the comet's tail in an opposite direction from the sun. This solution of the comet's tail does not solve the greater one of the repulsion of the comet itself. The pressure of the electric ions or corpuscles might force the tail away, but a greater electric force from the sun drives off the comet. Prof. J. J. Thomson and Arrhenius, a Swedish physicist, have by experiments discovered and elaborated the manner and principles on which the ions or corpuscles operate. Arrhenius discovered that these ions were conductors of electricity and why, and Prof. Thomson discovered each corpuscle had the same electric charge as an ion of hydrogen, and that each must be smaller than a hydrogen atom--in fact only a thousandth part of it. And here for the first time in the world's history science tells us there are bodies smaller than an atom--a thousand times smaller than an atom. We are told an atom is a thousand times smaller than the particles of invisible air we breath; now we have an ion a thousand times smaller than the atom. Surely the scientists have at last reached my theory of the fourth state of matter which I call the electro-magnetic. In fact these ions or corpuscles may be electricity itself or the atoms of electricity which science has at last discovered. And streams of these infinitesimal ions may constitute the swift and invisible currents of electricity which produce all natural phenomena. Prof. Blake, of the Kansas University, says: "Crookes called his cathode streams the fourth form of matter, but first to-day is such a state proven. Now, we must recognize at the beginning of this twentieth century a new form of matter. We have to deal with negatively charged particles so small that they have free paths of motion even among the atoms of substances."