Showing 1–17 of 17 items
Suggests FD call on Carl Semper.
Inquires about Porlieria: Do the leaves shut to check evaporation? Does it appear silver under water?
Explains how he thinks the pulvinus acts; wishes FD would investigate the point.
JIR’s brother writes from India in support of the protective function of plant sensitivity.
Has a magnificent bush of Porlieria. There is no vestige of bloom; CD will test for sleep movements. Reports successful experiments on temperature-induced sensitivity of radicles.
He has been talking to Julius von Sachs about sleeping plants that move with and without growth.
Describes sleep movements in Porlieria and his experiments on movements of radicles.
Thalia flowers have interesting mechanism to ensure cross-fertilisation.
Sleep in Porlieria studied.
Oats begin germinating.
Chlorophyll development in oat seedling.
Lists the sleeping plants he has seen.
Julius Sachs thinks Hugo de Vries has not cleared up everything [about climbing plants]. But Sachs has not worked on the mechanical problem.
Asks for list of families of sleeping plants. Believes sleep is merely modified circumnutation at a particular time of day.
Porlieria has had no water for some time but shows no sign of flagging.
Describes the response of Thalia flowers to touch.
Thinks it would be a good idea to give the typing machine to Karl Semper.
A report has arrived for FD which CD will forward.
More sleepers from green-house.
Julius Sachs’s view of climbing plants: he distinguishes between nutation to find a support and growth after support is found.
Discusses sleep movements of Porlieria.
Has read an abstract of Julius Wiesner on heliotropism and geotropism ["Die heliotropischen Erscheinungen im Pflanzenreiche", Anz. Kais. Akad. Wiss. Wien 15 (1878): 137–40] which seems important but is puzzling.
Gives details of his observations on climbing plants with reference to comments by Julius Sachs.
Has offered Carl Semper the writing machine.
Speculates on the mechanism of movement in plants and their reception of and response to stimuli.
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.
Is forwarding the writing machine to Carl Semper.
Is glad FD has taken up his old friends, the twiners.
Hopes to get heliotropic aerial roots from J. D. Hooker. Asks FD to find out whether any moulds or roots are apheliotropic. Is puzzled by heliotropism in subterranean roots.
Comments on function of bloom.
Describes the effect of water shortage on sleep movements in Porlieria.