JDH’s work on Gnetum: a living fossil.

Orchid anatomy.

Encloses lists of orchids and other specimens he would be interested in seeing.

Acropera anatomy puzzling. Malaxis anatomy deciphered.

Orchid anatomy.

Orchid homologies.

Sensitive responses in Catasetum.

Acropera becoming clear.

T. F. Jamieson impressed by JDH’s work on Himalayan glaciers.

Asks JDH to look at movement of labellum in an orchid.

Rostellum of Masdevallia.

JDH’s Fernando Po case.

Madeiran fauna pre-glacial according to Oswald Heer.

Orchid anatomy: homologies of column vascularisation.

Primula paper sent to Linnean Society.

CD fears he has misinterpreted vascularisation of butterfly orchid flowers.

Homologies of orchid flower vascularisation.

JDH’s letter on grounds of generalisation in plant morphology.

Faunal distribution and the glacial period.

Orchid homologies.

JDH asked to check Lindley on Acropera.

Transport of an orchid to Down.

Refers to Bates' admiration of ARW.

Acropera species may be males of other orchids.

Homologies of ducts in orchids.

Went to British Museum to see Bates’s mimetic butterflies.

Rudimentary ovules of Acropera.

High opinion of Bates.

Orchid anatomy.

Henri Lecoq’s miserable book on plant geography [Étude sur la géographie botanique de l’Europe (1854–8)].

H. W. Bates’s pleasure at meeting JDH.

Lindley suggests Gongora may be female Acropera.

CD’s orchid book nearly ready for press.

Discovers trimorphism in Lythrum is in H. Lecoq [Études sur la géographie botanique de l’Europe (1854–8)].

Seeks information on heating hothouses night and day.

Gongora cannot be female of Acropera; it may itself be a male.

Hopes Daniel Oliver will "sink Atlantis" in his Royal Institution lecture.