Copy letter, from Sir John Herschel to John Stuart Mill, 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. Sorry for the delay in response; John Frederick William Herschel has been ill for some time. John Stuart Mill has objected to P. S. Laplace's theory of probabilities; John Frederick William Herschel strongly supports Laplace. 22 December 1845