Has been looking at separation of sexes in poplars.

Interested in reversion.

Does not understand all CD said on inheritance.

JDH now remembers that Origin was "published" some time before it was "distributed" and therefore appeared prior to his own essay [see also 2478].

Impossible to say whether some Dipterocarpaceae survived a cold period or have developed since.

Studying self-sterility, particularly in Oncidium, where abortion occurs consistently but stigma functions normally. His hybrid orchid crosses show sterility occurs capriciously. Thus it is not a "special endowment".

Disputes Asa Gray’s and Hermann Crüger’s view of rostellar germination.

Doubts absolute sterility of Catasetum.

Disappointed by results with homomorphic cowslips.

Observations on Catasetum.

Figs require insects in order to set seed.

Observes Plantago’s out-crossing mechanism.

Observations of style lengths of primroses and cowslips.

Supports, in his orchid paper, CD’s view that sterility occurs at random [Trans. Bot. Soc. Edinburgh 7 (1863): 543–50].

Cannot get his Drosera paper published [abstract in Edinburgh New Philos. J. 2d ser. 17 (1863): 317–18].

Thanks CD for two letters and his portrait.

CD’s book [Orchids] opened up terra incognita for him.

His work on S. African butterflies continues.

Reports on a moth that punctures peach skins.

Interesting that thoughtful naturalists are forced to admit mutability of species.

Some notes on Oxalis.

Thanks JS for orchid paper [Trans. Bot. Soc. Edinburgh 7 (1863): 543–50]. JS presents excellent new facts on sterility of orchids.

His argument that coloured primroses are not hybrids is good, as is idea of discovering primrose parentage by breeding for colours.

Sees difficulties in adhering to the concept of design in nature.

Is surprised at Hooker’s and Daniel Oliver’s ignorance regarding spontaneous movements of tendrils.

CD should continue his work on climbing plants, "it will be fruitful in your hands".

Seeks investment advice.

Would like WED to send a specimen of the unusual plant organ of which he sent a drawing.

Will be glad to have CD.

Notes on drops of nectar on sepals of cypripedium.

Has been copying out references from Natural History Review [possibly D. Oliver, "The structure of the stem in dicotyledons; being references to the literature of the subject", Nat. Hist. Rev. n.s. 2 (1862): 298–329].

Suggests DO study high incidence of separate sexes in freshwater plants.

Asks correspondent whether, when growing hollyhocks, he finds it necessary to space out the different varieties to prevent crossing and thus to obtain true seed [see Variation 2: 108].

Notes, calculations, and diagrams on phyllotaxy.

Huxley’s lectures [Man’s place in nature (1863)]; he would be a scientific H. T. Buckle, if he were more careful.

Asks CD what the evidence is for inheritance of acquired characteristics.

Thanks for letting Horwood superintend erection of hothouse.

Discusses the female parts of the Primula flower; the true character of the free placenta is not completely understood.

Sends description of Chrysosplene, asks about glands.

Indignant over Owen’s conduct as described in Hugh Falconer’s article on elephants ["On the American fossil elephant of the regions bordering the Gulf of Mexico", Nat. Hist. Rev. (1863): 43–114].