A philosopher, in the neighborhood of Mount Krapak, argued with me that motion is essential to matter.

“Everything moves,” says he; “the sun continually revolves on its own axis; the planets do the same, and every planet has many different motions; everything is a sieve; everything passes through a sieve; the hardest metal is pierced with an infinity of pores, by which escapes a constant torrent of vapors that circulate in space. The universe is nothing but motion; motion, therefore, is essential to matter.”

“But, sir,” said I to him, “might not any one say, in answer to what you have advanced: This block of marble, this cannon, this house, this motion, are not in motion; therefore motion is not essential?”

“They do move,” he replied; “they move in space together with the earth by the common motion, and they move so incontestably — although insensibly — by their own peculiar motion, that, at the expiration of an indefinite number of centuries, there will remain not a single atom of the masses which now constitute them, from which particles are detaching themselves every passing moment.”

“But, my good sir, I can conceive matter to be in a state of rest; motion, therefore, cannot be considered essential to it.”

“Why, certainly, it must be of vast consequence whether you conceive it to be, or conceive it not to be, in a state of rest. I still repeat, that it is impossible for it to be so.”

“This is a bold assertion; but what, let me ask you, will you say to chaos?”

“Oh, chaos! If we were inclined to talk about chaos, I should tell you that all was necessarily in motion, and that ‘the breath of God moved upon the waters’; that the element of water was recognized in existence, and that the other elements existed also; that, consequently, fire existed; that there cannot be fire without motion, that motion is essential to fire. You will not succeed much with chaos.”

“Alas! who can succeed with all these subjects of dispute? But, as you are so very fully acquainted with these things, I must request you to inform me why one body impels another: whether it is because matter is impenetrable, or because two bodies cannot be together in one place; or because, in every case of every description, the weak is driven before the strong?”

“Your last reason is rather more facetious than philosophical. No person has hitherto been able to discover the cause of the communication of motion.”

“That, however, does not prevent its being essential to matter. No one has ever been able to discover the cause of sensation in animals; yet this sensation is so essential to them, that, if you exclude the idea of it, you no longer have the idea of an animal.”

“Well, I will concede to you, for a moment, that motion is essential to matter — just for a moment, let it be remembered, for I am not much inclined to embroil myself with the theologians — and now, after this admission, tell me how one ball produces motion in another?”

“You are very curious and inquisitive; you wish me to inform you of what no philosopher ............