Matter, Force, Particle

In the Metaphysical Foundations of Natural Science, Kant first defines 'matter' as that which is "movable in space".  Furthermore, it is "movable insofar as it fills a space".  Now, it fills a space by virtue of a "special moving force", namely, Repulsion.  More precisely, it "fills its space by the repulsive forces of all its parts."  However, by virtue of Repulsion alone, matter would "disperse itself to infinity".  Hence, it fills a determinate space only by virtue of Repulsion in coordination with a counter-force, namely, Attraction.  So, likewise, any determinate part of matter, i. e. any particle, is the product of a combination of Repulsion and Attraction.  If so, then it follows that particulate matter is not the substratum of motion, which, in the absence of any other concept of matter, contradicts the initial premise, a contradiction which the thesis of the infinite divisibility of matter does not circumvent.