Discusses EM’s book [Die Dolomit-Riffe von Südtirol und Venetien (1878–9)]. Pleased by EM’s views of geological chronology based on evolution. Thinks distribution of land and sea formerly very different. New genera and families may have been developed on isolated tracks and migrated.

Comments on achenia of Pumilio argyrolepis.

Sends letter and seeds from [F. J. Cohn].

Is working too hard.

Feels WHK’s views on the origin of tumbling in pigeons are very likely correct.

Has been observing the movements of leaves and cotyledons; sleep movements are exaggerated circumnutation. Reports some odd observations on movement in Oxalis species.

Can send FD twisted branches of some climbing plants if he wishes.

Asks questions related to movement in plants. The cotyledons of Oxalis offer a promising field for study.

Wonders why Julius von Sachs thinks bloom is a protection against insects.

Encloses notes on the cotyledons of Oxalis species.

Congratulates JWJ on marriage.

Thanks for essay by Neumayr [see 11569].

Comments on paper by Edmund Mojsisovics ["Kleine Beiträge zur Kenntniss der Anneliden", Sitzungsber. K. Akad. Wiss. Wien Math.-naturwiss. Cl. 76 (1877) Abt. 1: 7–20].

CD’s health better than a few years ago.

Discusses methods of fertilising potatoes.

Will dispatch the best twisted stems he can find.

Considers the role of the pulvinus in leaf movement.