383. These planetary chromatic arcs or bows of colour are related to the sun like the three terrestrial colours to the cosmic, or as the three terrestrial elements to fire. _Three_ planetary productions must have thus formed around the sun, because the light condenses, materializes itself in three moments. Therefore the planets range themselves in groups at three great distances. To the _first_ production belong Mercury, Venus, the Earth, Mars, Vesta, Juno, Ceres and Pallas. They are the first digression from Red, the Yellow; the Earthy preponderates in them. They are all placed close together. To the _second_ production belong Jupiter and Saturn; water rules them, and fluctuates visibly upon them; they are the Green. They range at a great distance from the former group. To the _third_ and most remote productions belongs Uranus; it is the Blue, in which the air preponderates. It again ranges at a great distance from the former group. The comets are naught but æther, which is about to become air. 384. The production of the earth-planets or of the first group is dispersed into so many as it is on account of the proximity of the sun, on account of the energy of the rays of light, as well as the import of the Earthy, which exists essentially under many forms. The planetary rings have been arranged like scales behind each other, like clouds through electrical pauses; but these repeat themselves more rapidly, in the neighbourhood of the sun. c. HEAT. 385. While the æther falls into a state of tension or shines, it is thrown into motion. This motion of æther manifests itself as the conatus or effort to extension. The extension, however, considered as a world-phenomenon, is _Heat_. 386. Light, when it operates upon terrestrial matter, excites this to special polarization, whereby the Ætherial that is in it is set in motion, i. e. heat is generated. 387. Light never moves directly the mass itself, but only the Ætherial that is in it. Through this motion of the æther it becomes separated from matter; and this separation is manifested as _free_ heat. 388. Heat is not matter itself any more than light is, but it is only the act of motion in the primary matter. In heat, as well as in light, there certainly resides a material substratum; yet this substratum does not give out heat and light; but the _motion_ only of the substratum gives out heat, and the _tension_ only of the substratum light. There is no body of heat; hydrogen is the body of heat, just as oxygen may be called the body of fire. 389. Heat is real space; into it all forms have been resolved, as all materiality has been resolved into gravity, and all activity, all polarity into light. Heat is the universal form, consequently the want of form. 390. Light properly develops heat out of matter through separation of the fixed poles from the substance, whereby the latter again passes over into æther.