Note 249 — Chapter VI

Footnote 249: (return) "It is our immediate consciousness of effort, when we exert force to put matter in motion, or to oppose and neutralize force, which gives us this internal conviction of power and causation, so far as it refers to the material world, and compels us to believe that whenever we see material objects put in motion from a state of rest, or deflected from their rectilinear paths and changed in their velocities if already in motion, it is in consequence of such an effort somehow exerted."--Herschel's "Outlines of Astronomy," p. 234; see Mansel's "Prolegomena," p. 133.