Copy letter, from Sir John Herschel to M. Perrey, 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. Gently rejects MP's offer to accompany John Frederick William Herschel to the Cape to act as John Frederick William Herschel's assistant. John Frederick William Herschel claims the voyage to be a 'pure family party of pleasure,' and if astronomy can not be well practiced at the Cape, the family may go on to India to visit the relatives of John Frederick William Herschel's wife, Margaret. 16 March 1833