]
night--Averrhoa: rapid movements of the leaflets--Porlieria: leaflets close
when plant kept very dry--Tropaeolum: leaves do not sleep unless well
illuminated during day--Lupinus: various modes of sleeping--Melilotus:
singular movements of terminal leaflet--Trifolium--Desmodium: rudimentary
lateral leaflets, movements of, not developed on young plants, state of
their pulvini--Cassia: complex movements of the leaflets--Bauhinia: leaves
folded at night--Mimosa pudica: compounded movements of leaves, effect of
darkness--Mimosa albida, reduced leaflets of--Schrankia: downward movement
of the pinnae--Marsilea: the only cryptogam known to sleep--Concluding
remarks and summary--Nyctitropism consists of modified circumnutation,
regulated by the alternations of light and darkness--Shape of first true
leaves...Page 317-417
CHAPTER VIII.
MODIFIED CIRCUMNUTATION: MOVEMENTS EXCITED BY LIGHT.
Distinction between heliotropism and the effects of light on the
periodicity of the movements of leaves--Heliotropic movements of Beta,
Solanum, Zea, and Avena--Heliotropic movements towards an obscure light in
Apios, Brassica, Phalaris, Tropaeolum, and Cassia--Apheliotropic movements
of tendrils of Bignonia--Of flower-peduncles of Cyclamen--Burying of the
pods--Heliotropism and apheliotropism modified forms of circumnutation--
Steps by which one movement is converted into the other--
Transversal-heliotropismus or diaheliotropism influenced by epinasty, the
weight of the part and apogeotropism--Apogeotropism overcome during the
middle of the day by diaheliotropism--Effects of the weight of the blades
of cotyledons--So called diurnal sleep--Chlorophyll injured by intense
light--Movements to avoid intense light.
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