FORE:The division of matter into minute and indestructible particles served admirably to account for the gradual formation and disappearance of bodies without necessitating the help of a creator. But the infinities assumed as a condition of atomism were of even greater importance. Where time and space are unlimited, the quantity of matter must be equally unlimited, otherwise, being composed of loose particles, it would long since have been dissipated and lost in the83 surrounding void. Now, given infinite time and space, and infinite atoms capable of combining with one another in various ways, all possible combinations must already have been tried, not once or twice, but infinitely often. Of such combinations, that which best fulfils the conditions of mechanical stability will last the longest, and, without being designed, will present all the characters of design. And this, according to Epicurus, is how the actual frame of things comes to be what it is. Nor was it only the world as a whole that he explained by the theory of a single happy accident occurring after a multitude of fortuitous experiments. The same process repeats itself on a smaller scale in the production of particular compounds. All sorts of living bodies were originally throw up from the earths bosom, but many of them instantly perished, not being provided with the means of nutrition, propagation, or self-defence. In like manner we are enabled to recall a particular thought at pleasure, because innumerable images are continually passing through the mind, none of which comes into the foreground of consciousness until attention is fixed on it; though how we come to distinguish it from the rest is not explained. So also, only those societies survived and became civilised where contracts were faithfully observed. All kinds of wild beasts have at different times been employed in war, just as horses and elephants are now, but on trial were found unmanageable and given up.162Other reasons for the extended and general use of steam as a power, besides those already named, are to be found in the fact that no other available element or substance can be expanded to a given degree at so small a cost as water; and that its temperature will not rise to a point injurious to machinery, and, further, in the very important property of lubrication which steam possesses, protecting the frictional surfaces of pistons and valves, which it is impossible to keep oiled because of their inaccessibility or temperature.
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