Copy letter, from Sir John Herschel to Mary Somerville Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father.. [Augustus] DeMorgan and [Henry Fox] Talbot are sending their papers to her. John Frederick William Herschel sends her his report on "Atmospheric Waves and Meteorological Districts" [for the British Association]. Family is well. Outlines a process for transferring photographic impressions on paper to glass, as described in the Athenaeum. 1845 ?.