Letter, from Wilhelm Struve to Sir John Herschel, dated at Pulkowa Autograph letter signed by sender. Regrets that his work at Pulkowa eliminates the possibility of being absent for longer periods of time and hopes to see John Frederick William Herschel in Russia. Mentions his and his son Otto Struve's most recent work. Wishes John Frederick William Herschel well in his new home at Collingwood. 8 January 1841