The specimens were probably those obtained by Joseph Dalton Hooker from Gustav Mann, who was collecting botanical specimens in West Africa for the Royal Botanic Gardens, Kew (see letter from J. D. Hooker, [15 March 1863]). CD and Woodbury, who was one of the contributors to the beekeeping section of the Journal of Horticulture and Cottage Gardener, had corresponded in the summer of 1862, when CD was writing the section for Variation about bees from different localities (see Correspondence vol. 10).