ABSTRACT
Sir, if I fall into a river, an unsophisticated man will jump in and bring me out; but a philosopher will look on with the utmost calmness, and consider me in the light of a projectile, and, making a calculation of the degree of force with which I have impinged the surface, the resistance of the fluid, the velocity of the current, and the depth of the water in that particular place, he will ascertain with the greatest nicety in what part of the mud at the bottom I may probably be found, at any given distance of time from the moment of my first immersion.
