But the more important ratio, the one essential to the point at issue here, is the one that holds in free motion in the first instance in the still conditioned motion of a falling body, where the quantitative values of time and space are reciprocally determined as root and square respectively; and then in the absolutely free motion of the celestial bodies, where the period of revolution and the distan are reciprocally determined, the one as one power lower than the other, as square and cube respectively.