Discusses the Duke of Argyll’s article on the supernatural [Edinburgh Rev. 116 (1862): 378–97].

Has heard that the Incas married their sisters; this may be worth investigating as a case of inbreeding.

Wants to know when he may visit CD.

Evidence of tropical floras continuous since Tertiary cannot fit CD’s position on intermittent cold periods.

Agrees with CD on reversion and latency.

Charles Martins of Montpellier will collect the varieties of silkworm for CD.

QdeB is battling with the polygenists in the Société d’Anthropologie.

Continues to support, in debates at the Société d’Anthropologie, the view that variability of animals and anatomical modifications are produced by environment. Wishes to use CD’s niata cattle example from Journal of researches [2d ed., pp. 145–6].

Owen is the author of the Athenæum article [28 Mar 1863, pp. 417–19]. JDH dismisses it as vulgar rubbish. W. B. Carpenter intends to write a reply.

Sends some specimens for CD.

Is busy with W. African Amomum, whose floral structure he discusses.