1835: Extracts from Letters to Henslow (read at a meeting of the Cambridge Philosophical Society on 16 November 1835, with comments by John Stevens Henslow and Adam Sedgwick, and printed for private distribution dated 1 December 1835. Selected remarks had been read by Sedgwick to the Geological Society of London on 18 November 1835, and these were summarised in Proceedings of the Geological Society published in 1836. Further extracts were published in the Entomological Magazine and, with a review, in the Journal of Natural History. A reprint was issued in 1960, again for private distribution)