Copy letter, from Sir John Herschel to Herbert Spencer, dated at Collingwood Copy of a letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. [Responding to Herbert Spencer's 1859-12-31,] John Frederick William Herschel presents additional problems in the nebular hypothesis, critiques in detail Herbert Spencer's views of the distribution of cometary orbits, and argues against Herbert Spencer's theory of sunspot formation. 12 January 1860