Praises JDH’s York address.

S. B. J. Skertchly has paralleled Axel Blytt’s work in Cambridgeshire fens.

JDH too cautious on southern glacial period.

Is Kew interested in Azores plants collected by Arruda Furtado, a local inhabitant and an evolutionist?

Comte [de Paris] will have plants next summer.

Arruda Furtado will send his mountain plants from Azores.

Visiting his son Horace.

Studying action of carbonate of ammonia. Finds similar looking Euphorbia root cells react differently.

Intrigued by Dischidia rafflesiana, whose pitchers manufacture manure-water that nourishes adventitious roots. Does JDH know histologist for detailed study?

Julius von Wiesner’s criticism of Movement in plants "vivisects" CD in "a most courteous but awful manner" [Das Bewegungsvermögen der Pflanzen (1881)].

Profuse thanks for plants.

Specifies which euphorbs he wants. Euphorbs’ alternate rows of ammonium carbonate reactive/non-reactive cells are worth more study.

Cannot read signature on letter sent via JDH from Lima.

Discusses ARW's view on European plants and effects of glaciers on Alpine plants.

Darwin remarks that "As far as I know no one ever discussed the meaning of the relation between representative species before I did & as I suppose Wallace did in his paper before the Linn. Soc. [1858].".