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Sends a query he would like GHD to put to Clerk Maxwell: why does a sponged leaf dry more rapidly, although sponging cannot remove the waxy bloom from the minute pores through which it is secreted?
Is very glad to hear about tides in the earth.
Hooker, just returned from U. S., says Pinus nordmanniana leaves are spread horizontally in the morning and rise during the day.
Has read WEG’s article ["The colour sense", Nineteenth Century 2 (1877): 366–88] on H. Magnus’ view. Informs him of a criticism of this view and reply by Magnus in Kosmos. Offers to send the article.
CD has contributed some facts on the difficulty children have in distinguishing colours (or naming them correctly).
Hive-bees captured in tubes of nectary of Tritoma. Seems a maladaptation of the bees.
Encloses his marriage present, which he fears Sara [Darwin née Sedgwick] will think "atrociously unsentimental", but he hopes useful.
Approves terms used in LAE’s manuscript. Discusses relative advantages of self-fertilisation and cross-fertilisation.
Thanks LAE for pointing out erratum [in Cross and self-fertilisation].
Is glad to hear R. B. Litchfield is better.
Discusses William Darwin’s engagement to Sara Sedgwick.
CD’s opinion of a specimen sent by JBI from an unknown tree, and the Ross-shire tale about it.
Thanks CD for present of £300.