In the world's history certain inventions and discoveries occurred, of peculiar value, on account of their great efficiency in facilitating all other inventions and discoveries. Of these were the art of writing and of printing - the discovery of America, and the introduction of Patent-laws. The date of the first ... is unknown; but it certainly was as much as fifteen hundred years before the Christian era; the second-printing-came in 1436, or nearly three thousand years after the first. The others followed more rapidly - the discovery of America in 1492, and the first patent laws in 1624.
