Bacon, J. 1861 Proc. Boston Soc, Natural History 7, pp 290-293, and 8, 1862, pp 59, 173. (Coconut pearls)

Cleghorn, H (1861) Notes upon the Coco-Nut Tree and its Uses. Read to the Botanical Society, May 9th, 1861. Eleven pages. With three plates from Edinr. New Phil. Journal New Series Vol XIV.

Tennent, Sir J. Emerson (1861) Sketches of the Natural History of Ceylon.