  Desgabets drew yet another, final consequence from Descartes’s discovery of the true nature of sensible qualities (and bodies). This consquence bears directly on our ability to see the right path to a true physics which was hitherto impossible. The true physics is one that recognizes that “everything that happens in matter by the different movements and modes of its parts, belongs to mathematics and mechanics, which have all of this for their object” (OPD 5: 166). The object of the true physics is not the substantial forms of the Scholastics, but matter whose essence is extension, and its modes which are nothing else but various divisions and groupings of its parts.  Thus, the natural object of the physcists is the same as the solid of the mathematician. The solid of the mathematicians, according to Desgabets, consists in a magnitude that has three dimensions, i.e., length, width, and thickness while the natural body of the physicist consists in a solid substance extended in three dimensions. This is the crowning statement of Desgabets’s metaphysical view that the physical world is really a single object or substance whose parts, under various divisions, shapes and arrangements, form all the appearances in the “grand theatre of nature” (OPD 5: 166).