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 a man of great talent and no less note. EMPEDOCLES asserts, "there is neither birth nor death, for any mortal; but only a combination, and a separation of that which was combined, and that this is what amongst men they call birth, and death." Again he remarks, "those are infants, or short-sighted persons, with very contracted understandings, who imagine any thing is born, which did not exist before, or that any thing can die or perish totally."

CHAP. IV.
Laws of Motion, common to every Being of Nature.&mdash;Attraction and Repulsion.&mdash;Inert Force.&mdash;Necessity.

Man is never surprised at those effects, of which he thinks he knows the cause; he believes he does know the cause, as soon as he sees them act in an uniform and determinate manner, or when the motion excited is simple: the descent of a stone, that falls by its own peculiar weight, is an object of contemplation to the philosopher only; to whom the mode by which the most immediate causes act, and the most simple motion, are no less impenetrable mysteries than the most complex motion, and the manner by which the most complicated causes give impulse. The uninformed are seldom tempted either to examine the effects which are familiar to them, or to recur to first principles. They think they see nothing in the descent of a stone, which ought to