Thanks HM for his review [of Forms of flowers, Kosmos 2 (1877–8): 286].

Thinks HM’s previous article was very important [Kosmos 2 (1877–8): 128–40]. CD will "heartily rejoice" if HM has explained the steps by which Rhamnus and Valeriana have been rendered dioecious.

Writing on vegetable physiology.

Nothing in CD’s life has ever interested him more than the fertilisation of such plants as Primula and Lythrum.