From George Henslow 13 April 1868
St Johns Parsonage | St Johns Wood
Dear Mr Darwin,
I have delayed writing, in order to have an opportunity of reading M. De Candolle’s paper for which let me give you very many thanks, & which I hope to return carefully in a short time.1 He has proved algebraically from assumed mathematical principles, analogous to the arrangt of leaves in nature, that the series of fractions are really convergents of a continued fraction,—as long since stated. (as M. Decandolle says, but not proved,) by Messrs Schimper & Braun 1838.2 This nothing whatever to do with my investigations though it is a corroboration of certain parts.
Please to thank Mrs (?) Darwin for kindly writing about the lectures in the N. of England. I have written to Miss Clough & offered my services; as I shall be very happy to give a course of lectures as proposed.3
With kind regards believe me | yrs very truly | Geo: Henslow
Thanks for Casimir de Candolle’s paper ["Théorie de l’angle unique en phyllotaxie", Arch. Sci. Phys. & Nat. 23 (1865): 199–212].
Please cite as
Darwin Correspondence Project, “Letter no. 6115,” accessed on 18 January 2017, http://www.darwinproject.ac.uk/DCP-LETT-6115