Copy letter, from Sir John Herschel to Richard Potter, dated at Slough Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Responds to Richard Potter's concerns about the nature of light and the interpretation of some interference experiments. John Frederick William Herschel believes that the undulatory theory of light is the best supported by the experiments at this time. 22 April 1832