Copy letter, from Sir John Herschel to William Whewell Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Asks William Whewell to approve cost of report forms to be sent to the Breslau Observatory. Has heard that William Whewell's book is nearing completion and contains 'heresy.' Has just submitted a paper on 'photographical matters' to the R.S.L. March 1839