Page:The Mathematical Principles of Natural Philosophy - 1729 - Volume 1.djvu/46

2 whatever differently condened. I have no regard in this place to a medium, if any uch there is, that freely pervades the intertices between the parts of bodies. It is this quantity that I mean hereafter everywhere under the name of Body or Mas. And the ame is known by the weight of each body, for it is proportional to the weight, as I have found by experiments on pendulums, very accurately made, which shall be hewn hereafter.

The motion of the whole is the Sum of the motions of all the parts; and therefore in a body double in quantity, with equal velocity, the motion is double; with twice the velocity, it is quadruple.

This force is ever proportional to the body whoe force it is; and differs nothing from the inactivity of the Mas, but in our manner of conceiving it. A body, from the inactivity of matter, is not without