Letter, from Henry Walter to Sir John Herschel, dated at Haselbury Bryan, Blandford [Dorset] Autograph letter signed by sender, with annotations by recipient. Was John Frederick William Herschel's examiner forty years ago. Please explain why northern winters, at perigee, are not colder than southern winters, at apogee. Gratified that John Frederick William Herschel is in office held by Isaac Newton. 31 March 1852