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. The observational data from FS regarding Gamma Virginis are so significant that John Frederick William Herschel begs FS to continue to observe and send John Frederick William Herschel the results. Comments on a number of other astronomical observational matters. 12 March 1833