Letter, from Thomas Maclear to Sir John Herschel, dated at Royal Observatory, Cape of Good Hope Autograph letter signed by sender. Now forwards [Andrew] Bain's Geological map, which had been delayed by the Agent. Has heard nothing definite regarding the transit circle but would appreciate John Frederick William Herschel's recommendation, together with those of Francis Beaufort and G. B. Airy. Gives details of the work at the Observatory. Estimates the cost of mounting the transit circle. 24 December 1851