When the Particle manifests along the lines of Expression it pushes itself away from the other Particle, and, consequently, also pushes the other Particle away. When it manifests along the lines of Impression, it pulls itself toward the other Particle, and at the same time pulls the other Particle toward itself. In both cases the "medium" of the pulling extends over the space separating them, as will be described in future chapters. This pulling and pushing is called by Chemistry "Attraction and Repulsion" of the Particles. It is perhaps unnecessary to state that the Force of the Attraction of Cohesion or of Chemical Affinity is much stronger than that of Gravitation, in the case of the same Particles. Otherwise, if one picked up a piece of iron, the Attraction of Gravitation would cause its particles to separate and fall to the ground, whereas, the Attraction of Cohesion and that of Chemical Affinity enable the Particles to counteract the pull of Gravitation, and thus remain intact. Compared with Cohesion or Chemical Affinity, the pull of Gravitation is incomparably weak. The force which holds together two atoms of water represents a high degree of dynamic power, and the shock of forcible separation of chemical atoms produces something akin to an explosion. So we see that the Attraction of the Particles, while of the same nature as Gravitation, is much higher in intensity. But notwithstanding the power of the Attraction, it seems to be a matter inherent in the nature of the Particle, and to represent a something like Will, in response to Desire. The varying "push and pull" or the two Desires, would necessarily cause a revolution of each Particle on its own axis, and a revolution around each other--besides many instances of rushing together and away from each other. In these forms of Motion is to be found the cause of the vibrations producing Radiant Energy, known as Light, Heat, Electricity and Magnetism. CHAPTER XI THE THEORY OF DYNAMIC THOUGHT From the preceding chapters we have learned that: (1) The forms of Force or Radiant Energy, known as Light, Heat, Magnetism and Electricity, are "Modes of Motion," arising from the Original Motion of the Particles of Substance (Molecules, Atoms, Corpuscles or Electrons). And that such Original Motion of the Particles arises from the Operation of The Law of Attraction; (2) That the forms of Attractive Force or Energy, known as Gravitation, Cohesion, Adhesion, Atomic Attraction, Chemical Affinity or Chemism, and Corpuscular Attraction, also arise from the operation of the Law of Attraction; (3) That, from the above, it follows that: All Manifestations of Force and Energy in Inorganic Substance (_viz._, both Radiant Energy in its forms of Light, Heat, Magnetism, Electricity, etc.; and also Attractive Energy in its forms of Gravitation, Cohesion, Adhesion, Chemical Affinity or Atomic Attraction and Corpuscular Attraction) arise from the operation of the Law of Attraction.