114. Sir I s a a c N e w t o n’s Book I.

bodies, to which they are contiguous. If any body were ly-ing on a table ; when that table shall be carried along, wefay the body rests upon the table, or perhaps absolutely, thatthe body is at rest. However philosophers must not reject alldistinction between true and apparent motions, any more thanastronomers do the distinction between true and vulgar time;for there is as real a difference between them, as will appearby the following conffderation. Suppose all the bodies ofthe universe to have their courses stopped, and reduced toperfect rest. Then suppose their present motions to be againrestored; this cannot be done without an actual impressionmade upon some of them at least. If any of them beleft untouched, they will retain their former state, that is,still remain at rest; but the other bodies, which arewrought upon, will have changed their former state of rest,for the contrary state of motion. Let us now suppose thebodies left at rest to be annihilated, this will make no al-teration in the state of the moving bodies; but the effectof the impression, which was made upon them , will stillftibffst. This shews the motion they received to be an ab-solute thing, and to have no necessary dependence uponthe relation which the body said to be in motion has to anyother body a .

94. Besides absolute and relative motion are distinguish-able by their Effects. One effect of motion is, that bodies,when moved round any center or axis, acquire a certain

* See Newton, princip. philos. pag.9. lin. 30.

power,.