Page:The Mathematical Principles of Natural Philosophy - 1729 - Volume 1.djvu/338

 ceae to attract the water upwards, and begin to attract the water downwards in the octants after the yzygies. And thence the greatet height of the water may happen about the octants after the yzygies; and the leat height about the octants after the quadratures; excepting only o far as the motion of acent or decent impreed by thee forces may by the vis inita of the water continue a little longer, or be topt a little ooner by impediments in its channel.

For the ame reaon that redundant matter in the æquatorial regions of a globe caues the nodes to go backwards, and therefore by the increae of that matter that retrogradation is increaed, by the diminution is diminihed, and by the removal quite ceaes; it follows, that if more than that redundant matter be taken away, that is, if the globe be either more depreed, or of a more rare conitence near the æquator than near the poles, there will arie a motion of the nodes in conequentia.

And thence from the motion of the nodes is known the contitution of the globe. That is if the globe retains unalterably the ame poles; and the motion (of the nodes) be in antecedentia, there is a redundancy of the matter near the equator; but if in conequentia, a deficiency. Suppoe an uniform and exactly phærical globe to be firt at ret in a free pace; then by ome impule made obliquely upon its uperficies to be driven from its place, and to receive a motion, partly circular and partly right forward. Becaue this globe is perfectly indifferent to all the axes that pas through its centre, nor has a greater propenity to one axis or to one ituation of the axis than to any others