Letter, from W. L. Newman to Sir John Herschel, dated at York Autograph letter signed by sender. Offering hospitality to John Frederick William Herschel should he attend the B.A.A.S. meeting at York. Has been studying the theory of the manufacture of achromatic telescopes. Comments on the quality of glass available. Swiss seems to be best, though expensive. Deplores the loss of Francis Baily. 19 September 1844