“Boys, there’s a good many curious things about law, and custom, and usage, and all that sort of thing, when you come to look at it; yes, and about the drift and progress of human opinion and movement, too. There are written laws — they perish; but there are also unwritten laws — they are eternal. Take the unwritten law of wages: it says they’ve got to advance, little by little, straight through the centuries. And notice how it works.

We know what wages are now, here and there and yonder; we strike an average, and say that’s the wages of to-day. We know what the wages were a hundred years ago, and what they were two hundred years ago; that’s as far back as we can get, but it suffices to give us the law of progress, the measure and rate of the periodical augmentation; and so,