Letter, from Thomas Maclear to Sir John Herschel, dated at Royal Observatory, Cape of Good Hope Autograph letter signed by sender. Sends observations made with the nine-foot equatorial, with comments. Received John Frederick William Herschel's Astronomy and the Logs. of Charles Babbage; the latter aroused protests in the family. [Archibald] Robertson sold five copies of the Astronomy instantly and has ordered further copies. 1 September 1849