Thanks BDW for new facts about Anthocaris [see 6156].

Asks BDW to observe stridulation apparatus in male and female lamellicorns.

Reports case of black retriever that always burrows in earth before giving birth and keeps pups in hole thereafter. CD’s book says this habit rare.

F. Müller’s corrections warrant stating that the English translation has "additions and corrections by the author".

Is gratified to hear his index [to Variation] is considered a good one.

Ernst Haeckel’s book [Generelle Morphologie (1868)], though speculative, strikes him as "one of the most remarkable books of our time".