1. Letter from J. S. Henslow to N. J. Winch, 25 September 1826 (Winch Letters W5.261, Linnean Society of London Library).
2. Lyell, C. Principles of Geology 1st edn Vol. 2 (London, 1832).
3. de Candolle, A. P. Physiologie Végétale (Paris, 1832).
4. Henslow, J. S. On the specific identity of the primrose, oxlip, cowslip, and polyanthus. Mag. Nat. Hist. & J. Zool. 3, 406–409 (1830).
5. Henslow, J. S. On the requisites necessary for the advance of botany. Mag. Zool. Bot. 1, 116–117 (1836).