These labours of Ulac's were not unknown to the mathematical world; and it was somewhat surprising that Milton had not heard of them, especially as, in his sketch of his own life in the _Defensio Secunda_, he professed his interest in Mathematics, and spoke of his visits to London from Horton for the purpose of picking up any novelties in that science.
At any rate, it was zeal for the dissemination of the mathematical books above-mentioned that had turned Ulac into a printer and bookseller.

In that capacity he certainly had been in London, trading in books generally, and he had been in difficulties there, though not of a kind discreditable to himself.

After he had been some years in London, trading peaceably, some London booksellers, jealous for their monopoly, had conspired against him, and tried to obtain an order from Archbishop Laud for the confiscation of his whole stock in trade.

Through the kind offices of Dr.Juxon, Bishop of London, this had been prevented, and he had been empowered to sell off his existing stock.

Nay, a little while afterwards, he had had a prospect, through the Royal Printers, of a full trading licence from the Archbishop, on condition of his buying from them copies of two heavy works they had printed by the Archbishop's desire--viz.
_Theophylact on St.Paul's Epistles_ and the _Catena of the Greek Fathers on Job_.