Correspondence with tradesmen, including letters from instrument makers; glass manufacturers; booksellers; stationers; bookbinders; opticians; grocers; waxed paper manufacturers; photographers; chemists; and ironmongers. The volume includes a price list from Alabaster and Co. for their balances and weights; a pamphlet advertising John Sonford's waxed papers; a photograph of a spectroscope taken by H.T. Reed and Co.; a circular advertising the 'Colonial Mail Line' steam ships; a circular advertising Horne and Thornthwaite's twenty guinea reflecting telescope; a prospectus from 'Nature'; a circular advertising the business of Comyn Ching and Co., sellers of 'Boyle's Patent Ventilators'; a prospectus for a 'Repertory of literary works on the subject of Pure and Mixed Mathematics' from the city of Dresden; and a prospectus, in German, advertising a two-part treatise by F.W. Bessel on astronomy.