Botanists are obliged to regard tendrils as either leaf- or stem-formations. Vitis, Passiflora, and Clematis are discussed. [See 4398.]

Sends Hermann Crüger’s paper ["A few notes on the fecundation of orchids and their morphology", J. Proc. Linn. Soc. Lond. (Bot.) 8 (1865): 127–35] for publication.

"Boasts" of confirmation that sexes are separate in Catasetum.

Thinks the paper by H. Crüger should appear in the Journal of the Linnean Society.

Struck with corresponding positions of tendrils and flower-stalks in Passiflora. Sends [W. E. Darwin’s] dissection drawings of earliest stages. Infers that tendril is a modified flower peduncle.

Requests DO look at mode of climbing in Tecoma.

Discusses homologies of plant organs.

The passion-flower tendril should be considered a modified branch rather than a modified flower. Considers the distinction between the peduncle and the leaf midrib.

Observations on climbing species of Tacoma. [Tecoma!?]

Thanks for information on Tecoma.

Cannot believe DO’s statement about Catasetum; is sure C. tridentatum sets seeds in its native country.

CD erred on Acropera, but how is it naturally fertilised?

Encloses memorandum on tendrils. Nature of tendrils in Modecca.

Asks DO to give enclosed [letter?] from John Scott to Hooker.

JS’s work on orchid self-sterility; Acropera has 371250 seeds in one capsule.

Wishes something could be done for Scott.

References to and résumés of articles on climbing plants.

Thanks for DO’s Lessons in elementary botany [1864].

Asks him to inquire whether there are any twining species of Passiflora.

Asks DO to draw diagram of Lythrum on board at Linnean Society for reference during the reading of CD’s paper.

Will be glad to do diagram for CD;

asks whether he has read a Hugo von Mohl paper [see 4349].

L. H. Palm [Über das Winden der Pflanzen (1827)] is better on climbing plants than H. von Mohl [Über den Bau und das Winden der Ranken und Schlingpflanzen (1827)].

Thanks for photograph.

If CD understood Nepenthes, he would understand every class of climbers.

Reports his limited observations on climbing of Nepenthes.

Will DO observe whether leaf [of Nepenthes] with pitcher ever wound round a stick? CD’s plant is improving.

Glad that Oliver is to review John Scott’s paper in the Natural History Review (Scott 1864a). Apologises that his enclosed references (now missing) are so paltry.

Requests addresses of J. E. Planchon, W. F. Hofmeister and M. J. Schleiden so he can send them copies of Lythrum paper [Collected papers 2: 106–31].