Copy letter, from Sir John Herschel to Wilhelm Struve, dated at Slough Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Discusses a variety of observations related to double stars, and asks FS to make some specific observations to compare with John Frederick William Herschel's work. Reveals John Frederick William Herschel's dream of going to the Southern Hemisphere for a number of years, but asks FS to keep it quiet, as 'many ties' stand in the way. 17 May 1831