Whether L'Estrange carried out his threat of prosecuting the three men who had set up since the Act, we do not know, but this is certain, that one of their number, John Darby, continued to work for many years after this, and was the printer of Andrew Marvell's _Rehearsal Transposed_, and a good deal else that galled the Government very much. In fact, the Act of 1662 was openly ignored, and new men set up presses every year. But of all this work it is almost impossible to trace what was done by individual printers. The bulk of the publications of the time bore the bookseller's name only, and it is very rarely indeed that the printer is revealed. Newcomb had the printing of the _Gazette_, and also printed most of Dryden's works that were published by Herringman; while Roycroft, we know, was employed by all those who wanted the best possible work, such men as John Ogilby, for instance, for whom he printed several works. Milton's _Paradise Lost_ came from the press of Peter Parker; but the printer of Bunyan's _Pilgrim's Progress_ is unknown to us. As it happens, there is not much lost by remaining in ignorance on this point. For no change whatever took place in the character of printing as a trade during the second half of the seventeenth century. There were only three foundries of note in London during that time, and none of them is considered to have produced anything particularly good. Indeed, one has only to glance at even the best work of that time to see how wretchedly the majority of the type was cast. The first of the three was the celebrated Joseph Moxon, who, in 1659, added type-founding to his other callings of mathematician and hydrographer. Having spent some years in Holland, he was very much enamoured of the Dutch types, and in 1676 he wrote a book entitled _Regulæ Trium Ordinum Literarum Typographicarum_, in which he endeavoured to prove that each letter should be cast in exact mathematical proportion, and illustrated his theory by several letters cast in that manner. Similar theories had been propounded in earlier days by Albert Durer and the French printer, Geoffrey Tory, but no improvement in printing ever resulted from them.