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Published online by Cambridge University Press: 15 September 2014
My object in this paper is to call attention to a few observations which occurred to me during a recent scientific survey of part of Central Africa, regarding the larger economy of tropical nature. And I wish especially, and with much deference, to attempt to supplement a well-known theory of Mr Darwin's, by bringing forward another claimant to the honour of being, along with the earth-worm, the leading organic agricultural and geological agent in nature.
note * page 137 Vegetable Mould and Earth- Worms, P 313.