If you wish to compare the centrifugal force of the small vortexes to that of the large ones in order thereby to judge whether the fonner of these forces can be the cause of bodies' hardness and elasticity, you can compare the centrifugal force had by a very small particle or a physical point to recede from its center with the centrifugal force had by a similar part of the earth to recede from the sun, which is the center of its revolution, or with a similar part of the volume of ethereal matter that is in equilibrium with the earth and that with a centrifugal force equal to its own constrains it to remain at the same distance from the sun.