234. The circumvolution of the planets around the sun is a _polar_ process of _attraction_ and _repulsion_, by virtue of the primary law in the solar system, by virtue of the light. The planet then can only be repelled in the neighbourhood of the sun from the sun, when it has the _same_ solar pole in itself, when it has become positive; and can only attract it at a distance from the sun, when it has received the opposite pole to the sun, or has become negative. 235. This is only conceivable in that the planet, while it draws nearer to the sun, extinguishes in itself by its _own_ power the negative pole, and produces on the contrary the positive pole, or becomes a sun; and that, as it removes itself from the sun, it again extinguishes the positive solar pole, and generates the negative planetary pole within itself. This substantial production of alternating poles upon the planet takes place through the diversity of its surface as water and land, through the oblique position of its axis, whereby summer and winter are produced, through the processes, or through the life that is upon it, through the processes of decomposition and combination effected by water, through the revival and death of vegetation, and even the white colour of snow. The planet discharges its pole in the neighbourhood of the sun, like a cork pellet, and reloads of itself at a distance from the sun; and thus oscillates to and fro, like the hammer in an electrical bell. The course of the planets takes place with the greatest ease. It is everywhere no force of weight, of impulse, but of the easiest self-motion. The planet revolves by its own force to and from the sun, like the blood circulates to and from the heart. 236. The planet cannot, however, be diverted from its course, because the other heavenly bodies, probably the comets, do not act mechanically but only polarly upon it. By means of this polarity they maintain themselves always at a distance, even as the sun keeps itself at a distance from the planets. In addition to this, the polar tension between the comet and the sun is stronger than between the comet and the planets. The perturbations of the planets depend upon their polar relations to each other. Although the planets have a centrifugal tendency, they are not thrown by a prodigious mechanical force in the direction of the tangent, and then drawn back by an attractive force of the sun, that has no import or meaning; but they course in a playful manner round the sun. A theory of attraction of this kind has no physical sense. Such an attraction is a _Qualitas occulta_, an angel which flies before the planets. It does not create the world by impulses and strokes, but only by vivification.