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. Discusses John Frederick William Herschel's chemical experiences with sulphuret of lead. Leaves for the continent 'on Monday next.' Has conditionally accepted a position on the Royal Commission on the Universities of Oxford and Cambridge. 21 August 1850