Johnson this year gave at once a proof of his benevolence, quickness of apprehension, and admirable art of composition, in the assistance which he gave to Mr. Zachariah Williams, father of the blind lady whom he had humanely received under his roof. Mr. Williams had followed the profession of physick in Wales; but having a very strong propensity to the study of natural philosophy, had made many ingenious advances towards a discovery of the longitude, and repaired to London in hopes of obtaining the great parliamentary reward. He failed of success; but Johnson having made himself master of his principles and experiments, wrote for him a pamphlet, published in quarto, with the following title: "An Account of an Attempt to ascertain the Longitude at Sea, by an exact Theory of the Variation of the Magnetical Needle; with a Table of the Variations at the most remarkable Cities in Europe, from the year 1660 to 1680." To diffuse it more extensively, it was accompanied with an Italian translation on the opposite page, which it is supposed was the work of Signor Baretti, an Italian of considerable literature, who having come to England a few years before, had been employed in the capacity both of a language master and an authour, and formed an intimacy with Dr. Johnson. This pamphlet Johnson presented to the Bodleian Library. On a blank leaf of it is pasted a paragraph cut out of a newspaper, containing an account of the death and character of Williams, plainly written by Johnson. –James Boswell, Life of Johnson