Hardy's friends during his apprenticeship to John Hicks included Horace Moule (one of the eight sons of Henry Moule), and the poet William Barnes, both ministers of religion. Moule remained a close friend of Hardy's for the rest of his life, and introduced him to new scientific findings that cast doubt on literal interpretations of the Bible, such as those of Gideon Mantell. Moule gave Hardy a copy of Mantell's book The Wonders of Geology (1848) in 1858, and Adelene Buckland has suggested that there are "compelling similarities" between the "cliffhanger" section from A Pair of Blue Eyes and Mantell's geological descriptions. It has also been suggested that the character of Henry Knight in A Pair of Blue Eyes was based on Horace Moule.
