Copy letter, from Sir John Herschel to William Whewell, dated at Collingwood Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Informs William Whewell when John Frederick William Herschel and wife will arrive at Trinity Lodge for B.A.A.S. meeting, before which John Frederick William Herschel proposes a meeting of the magnetic committee. 2 June 1845