Ii8 of the Newtonian system,

rather such a perfect identity of effects, can onlyarise from an identity of causes.

These discoveries are, like the genius of theirauthor, universal; but before we proceed anyfarther, it will be proper to enquire a little intothe nature of gravitation in general, that power-ful agent, which produces so many astonishingeffects. It has been shewn, that by the actionof this invisible power, a stone is made to fall tothe ground, the moon circulates about the earth,and the satellites of Jupiter and Saturn roundthe bodies of those planets. The Newtoniandoctrine, which proves the truth of these lawsfrom mathematical principles, is called theSystem of Universal Gravitation, or Attraction.But what is this occult principle of sympathyand union, which gives life and motion to inani-mate beings, and how does it act ? The effectsare visible, but the agent that produces them ishid from our senses. It eluded the search ofNewton himself; he that soared to the utmostregions of space, and looked through naturewith the eye of an eagle, was unable to dis-,cover it.

That there is, however, such a principle, isnot to be doubted. To deny its existence,would be to deny the truth of facts, establishedboth by experiment and demonstration. Thattwo distant bodies will approach towards each

other^