Büchner. In a very simple manner: “Whether we investigate the extension of matter in its magnitude or minuteness, we never come to an end or to an ultimate form of it. When the invention of the microscope disclosed unknown worlds, and exhibited to the eye of the investigator the infinite minuteness of organic elements, the hope was raised that we might discover the ultimate organic atom, perhaps the mode of its origin. This hope vanished with the improvement of our instruments. The microscope showed that in the hundredth part of a drop of water there existed a world of animalcules, of the most delicate and definite forms, which move and digest like other animals, and are endowed with organs, the structure of which we have little conception of” (p. 23). “We term the most minute particle of matter, which we imagine to be no longer capable of division, an atom, and consider matter to be composed of such atoms, acquiring from them its qualities, and existing by their reciprocal attraction and repulsion. But the word atom is merely an expression for a necessary conception, required for certain purposes. We have no real notion of the thing we term atom; we know nothing of its size, form, composition, etc. No one has seen it. The speculative philosophers deny its existence, as they do not admit that a thing can exist which is no longer divisible. Thus neither observation nor thought leads us, in regard to the minuteness of matter, to a point where we can stop; nor have we any hope that we shall ever reach that point” (p. 24, 25).
Reader. That point has been reached, doctor. The theory of primitive, unextended elements is well known and advocated by good scientists and thoughtful philosophers. But let this pass, as I long for your demonstration of the infinity of matter.
Büchner. “Like the microscope in respect to the minuteness, so does the telescope conduct us to the universe at large. Astronomers boldly thought to penetrate into the inmost recesses of the world; but the more their instruments were improved, the more worlds expanded before their astonished eyes. The telescope resolved the whitish nebulæ in the sky into myriads of stars, worlds, solar and planetary systems; and the earth with its inhabitants, hitherto imagined to be the crown and centre of existence, was degraded from its imaginary height to be a mere atom moving in universal space. The distances of the celestial bodies are so immense that our intellect wonders at the contemplation of them, and becomes confused. Light, moving with a velocity of millions of miles in a minute, required no less than two thousand years to reach the earth from the galaxy! And the large telescope of Lord Rosse has disclosed stars so distant from us that their light must have travelled thirty millions of years before it reached the earth. But a simple observation must convince us that these stars are not at the limit of space. All bodies obey the law of [pg 648] gravitation, and attract each other. In assuming, now, a limitation, the attraction must tend towards an imagined centre of gravity, and the consequence would be the conglomeration of all matter in one celestial body. However great the distances may be, such an union must happen; but as it does not happen, although the world exists from eternity, there can be no attraction towards a common centre. And this gravitation towards a centre can only be prevented by there being, beyond the bodies visible to us, others still further which attract from without—and so forth ad infinitum. Every imagined limitation would render the existence of the world impossible” (pp. 25, 26).
Reader. Is this the whole of your argument?
Büchner. Yes, sir.
Reader. I should like to know how could the large telescope of Lord Rosse disclose stars so distant from us that their light must have travelled thirty millions of years before it reached the earth? Do you not know that in thirty millions of years light travels two million millions of times over the distance from the earth to the sun? And do you hope the world will believe that, thanks to Lord Rosse's telescope, it has been possible to determine the parallax of a star two million millions of times more distant from us than we are from the sun? The world indeed is ignorant and credulous; but when the lie is too impudent, it is apt to cry you down as a charlatan. You are most imprudent, doctor. You had no need of Lord Rosse's telescope for your argumentation; and your mention of the distant stars disclosed by it was therefore an inexcusable blunder. But the argument itself has no foundation. You imagine that, if the world were not infinitely expanded in all directions, all matter, by universal gravitation, would have conglomerated into one celestial body. But tell me, Does the moon gravitate towards the earth?
Büchner. Of course it does.
Reader. How do you account, then, for the fact that the moon has not fallen, nor is likely to fall, on the earth? Is it because the moon is attracted by some matter lying outside its orbit?
Büchner. It is on account of centrifugal force accompanying its curvilinear motion.
Reader. I am delighted to see that you can explain the fact without appealing to the infinity of matter. Let us go on. As the moon gravitates towards the earth, so do all satellites towards their planets, and all planets towards the sun. And yet none of the satellites have fallen into their planets, and none of the planets into the sun. Is this owing to the matter which lies outside of the planetary and solar system? I presume, doctor, that the enormous distance of fixed stars from us will not encourage you to believe that their attraction on any planet can cope with its gravitation towards the sun. On the other hand, this gravitation is not neutralized by the action of any exterior matter; for all planets actually obey the solar attraction, as their orbital movement conclusively shows. This same orbital movement implies also a centrifugal tendency; and this tendency sufficiently prevents the falling of the planets on the sun. This is unquestionable doctrine.