“But would not the state of the universe fill an infinite number of books!? How can each monad store so much knowledge?”
“It does because it has to,” said the Doctor. “Don’t think of books. Think of a mirrored ball, which holds a complete image of the universe, yet is very simple. The ‘brain’ of the monad, then, is a mechanism whereby some rule of action is carried out, based upon the stored state of the rest of the universe. Very crudely, you might think of it as like one of those books that gamblers are forever poring over: let us say, ‘Monsieur Belfort’s Infallible System for Winning at Basset.’ The book, when all the verbiage is stripped away, consists essentially of a rule—a complicated one—that dictates how a player should act, given a particular arrangement of cards and wagers on the basset-table. A player who goes by such a book is not really thinking, in the higher sense; rather, she perceives the state of the game—the cards and the wagers—and stores that information in her mind, and then applies Monsieur Belfort’s rule to that information. The result of applying the rule is an action—the placing of a wager, say—that alters the state of the game. Meanwhile the other players around the table are doing likewise—though some may have read different books and may apply different rules. The game is, au fond, not really that complicated, and neither is Monsieur Belfort’s Infallible System; yet when these simple rules are set to working around a basset-table, the results are vastly more complex and unpredictable than one would ever expect. From which I venture to say that monads and their internal rules need not be all that complicated in order to produce the stupendous variety, and the diverse mysteries and wonders of Creation, that we see all about us.”
“Is Dr. Waterhouse going to study monads in Massachusetts, then?” Caroline asked.
“Allow me to frame an analogy, once more, to Alchemy,” Daniel said. “Newton wishes to know more of atoms, for it is through atoms that he’d explain Gravity, Free Will, and everything else. If you visited his laboratory, and watched him at his labours, would you see atoms?”
“I think not! They are too small,” Caroline laughed.
“Just so. You instead would see him melting things in crucibles or dissolving them in acids. What do such activities have to do with atoms? The answer is that Newton, unable to see atoms with even the finest microscope, has said, ‘If my notion of atoms is correct, then such-and-such ought to happen when I drop a pinch of this into a beaker of that.’ He gives it a go and sees neither success nor failure but some other thing he did not anticipate; then he goes off and broods over it, and re-jiggers his notions of atoms, and devises a new experimentum crucis, and re-iterates. Likewise, if your highness were to visit Massachusetts and see me at work in my Institute, you’d not see any monads lying about on counter-tops. Rather you would see me toiling over machines that are to thinking what beakers, retorts, et cetera, are to atoms: Machines that, like monads, apply simple rules to information that is supplied to them from without.”
“How will you know that these machines are working as they ought to? A clock may be compared to the wheeling of the heavens to judge whether it is working aright. But what is the action that your machine will take, after it has applied the rule, and made up its mind? And how will you know whether it is correct?”
“That is easier than you might suppose. For as Dr. Leibniz has pointed out, the rules need not be complicated. The Doctor has written out a system for conducting logical operations through manipulation of symbols, according to certain rules; think of it as being to propositions what algebra is to numbers.”
“He has already taught me some of that,” said Caroline, “but I never phant’sied it had anything to do with monads and so forth.”
“That system of logic may be imbued into a machine without too much difficulty,” said Daniel. “And a quarter of a century ago, Dr. Leibniz, building upon the work of Pascal, built a machine that could add, subtract, divide, and multiply. I mean simply to carry the work forward. That is all.”
“How long will it take?”
“Years and years,” said Daniel. “Longer, if I were to try to do it amid the distractions of London. So, as soon as I have delivered you to Berlin, I shall begin heading west, and not stop for long until I have reached Massachusetts. How long shall it take? Suffice it to say that by the time I have anything to show for my labors, you’ll be full-grown, and a Queen of some Realm or other. But perhaps in an idle moment you may recall the day you went to Berlin in a coach with two strange Doctors. It may even occur to you to ask yourself what became of the one who went off to America to build the Logic Mill.”