Has been investigating nutational movements of climbing plants; comments on the opinions of Julius von Wiesner and Julius Sachs. Remarks on the sleep movements of certain plants and the mechanism of tendril curvature. Is experimenting with Porlieria.

Has visited K. G. Semper’s laboratory.

Notes Julius Sachs’s opinion on the heliotropism of moulds: he can see no use in the response.

C. E. Stahl is working on swarm spores which can be made both helio- and apheliotropic.

Sachs has told him that some ferns sleep, and he suspects that some grasses may move.

Sachs also feels they may be working at bloom from a wrong point of view and suggests leaves may need to keep dry in order to keep their stomata open.

Sachs jumps to the conclusion twiners and tendrils are similar from the Menispermum that twined without a stick. Akebia grows down a stick; not only the free end is involved.

Sleeping plants.

Experiments on effects of removing "bloom" from leaves and fruit.

He has been working hard at Kew for two days.

Horse chestnut roots have not acted at all well.

Many thnks for the pelargonium letter.

He has had no success with horse or Spanish chestnuts.

Directs CD where to find tools in his room. Has been looking at agave and aloe flowers. Thanks family for their letters.

Astonished at circular and will risk revolutions to invest. Describes Blidah, Algeria.

Fungus is an Aecidium. Porliera, Anthuriums and Aroids will hopefully sprout if weather gets hot. Sachs has changed his ideas about the cause of heliotropism. Describes men he is sharing a lab with.

Geotropism.

Experimenting on Porlieria in damp and dry earth.

Hermann Müller has been ridiculed for teaching children "in the beginning was Carbon".

Will ask about Ernst Krause.

Reports on roots and climbing plants experiments he is performing in Sachs’ laboratory. Orchids with air roots have come. Goebel says proshelic better than helic.

Discusses results of geotropism experiment. Has started some heliotropic caustic experiments on mustard roots. Has trouble making marks.

Heliotropism nomenclature. Apheliotropic mustard roots grow more quickly in dark. Measures growth with microscope as S. H. Vines did in mould. Studying air roots.

FD’s and Stahl’s negative opinion of Sachs.

Describes bean experiments. Will tell Emma Darwin to tell Elizabeth Darwin that he has written to the Riffel.

Pressure paralyses the streaming of protoplasm in the hairs of Tradescantia.

Discusses Müller-Thurgau’s work on heliotropism. Will start on Thursday for Heidelberg and Strassburg.