[22] Principia, b. iii. prop. x.
[23] Paley.
[24] If the Laws of Motion are stated as three, which we conceive to be the true view of the subject, the other two, as applied in mechanical reasonings, are the following:
Second Law. When a force acts on a body in motion, it produces the same effect as if the same force acted on a body at rest.
Third Law. When a force of the nature of pressure produces motion, the velocity produced is proportional to the force, other things beings equal.
[25] Though Friction is not concerned in any cosmical phenomena, we have thought this the proper place to introduce the consideration of it; since the contrast between the cases in which it does act, and those in which it does not, is best illustrated by a comparison of cosmical with terrestrial motions.
[26] Butler, Serm. 3.
[27] Müller, Infusoria, Preface.
[28] Monas. Müller. Cuvier.
[29] Volvox.