Letter, from Thomas Maclear to Sir John Herschel, dated at Royal Observatory, Cape Town Autograph letter signed by sender. Awful night of thunder, wind, and rain; floods around the Observatory. Gives rainfall since 22 June. Has written to [J. D.?] Thompson to observe tides at Simon's Bay. Has no one at Table Bay. Measured Alpha Centauri on the meridian. Found John Frederick William Herschel's planetary nebulae with the mural circle. 6 July 1837