Page:The Mathematical Principles of Natural Philosophy - 1729 - Volume 1.djvu/60

16 greatet it produc'd no endeavour to recede from the axe: the water hew'd no tendency to the circumference, nor any acent towards the ides of the veel, but remain'd of a plain urface, and therefore its True circular motion had not yet begun. But afterwards, when the relative motion of the water had decreas'd the acent thereof towards the ides of the veel, prov'd its endeavour to recede from the axe; and this endeavour hew'd the real circular motion of the water perpetually increaing, till it had acquir'd its greatet quantity, when the water reted relatively in the veel. And therefore this endeavour does not depend upon any tranlation of the water in repect of the ambient bodies, nor can true circular motion be defin'd by uch tranlations. There is only one real circular motion of any one revolving body, correponding to only one power of endeavouring to recede from its axe of motion, as its proper and adequate effect: but relative motions in one and the ame body are innumerable, according to the various relations it bears to external bodies, and like other relations, are altogether detitute of any real effect, any otherwie than they may perhaps participate of that one only true motion. And therefore in their ytem who uppoe that our heavens, revolving below the phere of the fixt Stars, carry the Planets along with them; the everal parts of thoe heavens, and the Planets, which are indeed relatively at ret in their heavens, do yet really move. For they change their poition one to another (which never happens to bodies truly at ret) and being carried together with their heavens, participate of their motions, and as parts of revolving wholes, endeavour to recede from the axe of their motions.

Wherefore relative quantities, are not the quantities themelves, whoe names they bear, but thoe enible Rh