SECT. LXXXIV. Atoms cannot make any Compound by the Motion the Epicureans

Suppositions, although the same should be granted them.

Let us still attend the Epicureans even in their most fabulous suppositions, and carry on the fiction to the last degree of complaisance. Let us admit motion in the essence of bodies, and suppose, as they do, that motion in a direct line is also essential to all atoms. Let us bestow upon atoms both a will and an understanding, as poets did on rocks and rivers. And let us allow them likewise to choose which way they will begin their straight line. Now, what advantage will these philosophers draw from all I have granted them, contrary to all evidence? In the first place, all atoms must have been in motion from all eternity; secondly, they must all have had an equal motion; thirdly, they must all have moved in a direct line; fourthly, they must all have moved by an immutable and essential law.

I am still willing to gratify our adversaries, so far as to suppose that those atoms are of different figures, for I will allow them to take for granted what they should be obliged to prove, and for which they have not so much as the shadow of a proof. One can never grant too much to men who never can draw any consequence from what is granted them; for the more absurdities are allowed them, the sooner they are caught by their own principles.

assign them.

These atoms of so many odd figures--some round, some crooked, others triangular, &c.--are by their essence obliged always to move in a straight line, without ever deviating or bending to the right or to the left; wherefore they never can hook one another, or make together any compound. Put, if you please, the sharpest hooks near other hooks of the like make; yet if every one of them never moves otherwise than in a line perfectly straight, they will eternally move one near another, in parallel lines, without being able to join and hook one another. The two straight lines which are supposed to be parallel, though immediate neighbours, will never cross one another, though carried on ad infinitum; wherefore in all eternity, no hooking, and consequently no compound, can result from that motion of atoms in a direct line.