Copy letter, from Sir John Herschel to Edward Sabine, 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. Further recommendations regarding useful equipment and observations to be made in India [see John Frederick William Herschel's 1866-8-11]. Agrees that meteorological experiments there are desirable. Offers John Frederick William Herschel's son John's experience of India to Edward Sabine. 4 September 1866