Lectures de Potentia Restitutiva, or of Spring

and the more easily do they mix and participate in its motion.

The particles of all solid bodies do immediately touch each other; that is, the vibrative original: "Vibrative"; referring to a rapid back-and-forth oscillation motions of the bodies do every one touch each other at every vibration. For explanation, let A, B, and C represent three bodies. Each of these bodies I suppose to have a vibrative motion on either side of it: A between D and E, B between E and F, and C between F and G.

I suppose then that B, in every one of its vibrations, does meet A at E, and C at F, and so the motions are continually interchanged. That is, B communicates its motion to A at E, and A at the same time and place communicates its motion to B. B, returning to F, meets there with C and communicates its received motion to C, which at the same instant and place communicates its own motion to B, which returns it back to E.

So the velocity original: "Velocity"; speed in a specific direction of these bodies is always the same, and each body impresses on the contiguous original: "contiguous"; touching or sharing a common border bodies such a determinate original: "determinate"; fixed or specific number of pulses within a certain space of time. Suppose, for instance, in every second of time B communicates to A and to C one million pulses, and has received as many from each of them. By this means, each of them does preserve its own space of vibration, according to the power of its vibration, so that neither of the contiguous bodies can enter into it.

The extreme original: "extreme"; the outermost particles A and C are repercussed original: "repercussed"; driven back or reflected by the motion of the ambient original: "ambient"; surrounding heterogeneous original: "Heterogeneous"; consisting of diverse or different ingredients fluid. In this fluid, even though the bodies are of differing magnitudes, the body and motion of the one are equivalent to the body and motion of the other; so that wherever the body is smaller, the motion is quicker, and where the body is bigger, the motion is slower. But the particles of fluid...