Circumnutation modified through innate causes or through the action of
external conditions--Innate causes--Climbing plants; similarity of their
movements with those of ordinary plants; increased amplitude; occasional
points of difference--Epinastic growth of young leaves--Hyponastic growth
of the hypocotyls and epicotyls of seedlings--Hooked tips of climbing and
other plants due to modified circumnutation--Ampelopsis tricuspidata--
Smithia Pfundii--Straightening of the tip due to hyponasty--Epinastic
growth and circumnutation of the flower-peduncles of Trifolium repens and
Oxalis carnosa...Page 263-279


CHAPTER VI.

MODIFIED CIRCUMNUTATION: SLEEP OR NYCTITROPIC MOVEMENTS, THEIR USE: SLEEP
OF COTYLEDONS.

Preliminary sketch of the sleep or nyctitropic movements of leaves--
Presence of pulvini--The lessening of radiation the final cause of
nyctitropic movements--Manner of trying experiments on leaves of Oxalis,
Arachis, Cassia, Melilotus, Lotus and Marsilea and on the cotyledons of
Mimosa--Concluding remarks on radiation from leaves--Small differences in
the conditions make a great difference in the result - Description of the
nyctitropic position and movements of the cotyledons of various plants--
List of species--Concluding remarks--Independence of the nyctitropic
movements of the leaves and cotyledons of the same species--Reasons for
believing that the movements have been acquired for a special
purpose...280-316


CHAPTER VII.