Copy of draft letter, from Sir John Herschel to Jean Baptiste Biot, dated at Collingwood Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Was very pleased to receive another of Jean Baptiste Biot's works. Glad to be associated in his revelations concerning molecular and polarization powers. Recall their past meetings and hopes to renew acquaintance in Paris at some future date. 4 September 1860