Letter, from John R. Hind to Sir John Herschel, dated at 11 Hanover Cottages Autograph letter signed by sender. Sends an interesting result of the comet computed by Mr. Barber of Etwell. W. R. Dawes's observations are about to be printed. Wilhelm Struve has some curious optical equations. Will be pleased to see Dr. [Henry?] Holland when he arrives. 28 February 1850