Chapter 6, Footnote #02
Physical analogy to circumstances influencing sensibility
Thus, in physical bodies, the momentum of a ball put in motion by impulse, will be influenced by the circumstance of gravity: being in some directions increased, in others diminished by it. So in a ship, put in motion by the wind, the momentum and direction will be influenced not only by the attraction of gravity, but by the motion and resistance of the water, and several other circumstances.