(William), eminent in an art of the greatest consequence to literature, the art of letter-founding, was born in 1602, in that part of the town of Hales Owen which is situated in Shropshire. Tho' by nature he justly attained the character of being the Coryphe-cholus, in that employment, he was not brought up to the business; and it is observed by Mr Mores, that this handy-work is so concealed among the artificers of it, that he could not discover that any one had taught it to another, but every person who had used it had learned it of his own genuine inclination. Mr Caslon served a regular apprenticeship to an engraver of ornaments on gun-barrels; and after the expiration of his term, carried on this trade in Vine-street, near the Minories. He did not, however, solely confine his ingenuity to that instrument; but employed himself likewise in making tools for the book-binders, and for the chafing of silver plate. Whilst he was engaged in this business, the elder Mr Bowyer accidentally saw, in a bookseller's shop, the lettering of a book uncommonly neat; and inquiring who the artist was by whom the letters were made, was hence induced to seek an acquaintance with Mr Caslon. Not long after, Mr Bowyer took Mr Caslon to Mr James's foundery, in Bartholomew-closet. Caslon had never before that time seen any part of the business; and being asked by his friend, if he thought he could undertake to cut types, he requested a single day to consider the matter, and then replied that he had no doubt but he could. Upon this answer, Mr Bowyer, Mr Bettenham, and Mr Watts had such a confidence in his abilities, that they lent him £500l. to begin the undertaking, and he applied himself to it with equal assiduity and success. In 1720, the society for promoting Christian knowledge, in consequence of a representation from Mr Solomon Negri, a native of Damascus in Syria, who was well skilled in the Oriental tongues, and had been professor of Arabic in places of note, deemed it expedient to print, for the use of the Eastern churches, the New Testament and Psalter in the Arabic language. These were intended for the benefit of the poor Christians in Palestine, Syria, Mesopotamia, Arabia, and Egypt, the constitution of which countries did not permit the exercise of the art of printing. Upon this occasion Mr Caslon was pitched upon to cut the font; in his specimens of which he distinguished it by the name of English Arabic. Under the farther encouragement of Mr Bowyer, Mr Bettenham, and Mr Watts, he proceeded with vigour in his employment; and he arrived at length to such perfection, that he not only freed us from the necessity of importing types from Holland, but in the beauty and elegance of those made by him he so far exceeded the productions of the best artificers, that his workmanship was frequently exported to the Continent. In short, his foundry became, in process of time, the most capital one that exists in this or in foreign countries. Having acquired opulence in the course of his employment, he was put into the commission of the peace for the county of Middlesex. Towards the latter end of his life, his eldest son being in partnership with him, he retired in a great measure from the active execution of business. His death happened in January 1766.