CONTENTS. Vii 



CHAPTER V. 



MODIFIED CIRCUMNUTATION : CLIMBING PLANTS ; EPINASTIC AND 

 HYPONASTIC MOVEMENTS. 



Circumautation modified through innate causes or through the action 

 of external conditions Innate causes Climbing plants ; simi- 

 larity of their movements with those of ordinary plants ; in- 

 creased 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 OP COTYLEDONS. 



Preliminary sketch of the sleep or nyctitropic movements of leaves 

 Presence of pulvini The lessening of radiation the final cause 

 of nictritropic movements Manner of trying experiments on 

 leaves of Oxalis, Arachis, Cassia, Melilotus, Lotus and Marsilea, 

 and on the cotyledons of Mimosa Concluding remarks on radia- 

 tion 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. 



MODIFIED CIRCUMNUTATION: NYCTITROPIC OR SLEEP MOVEMENTS 

 OF LEAVES. 



Conditions necessary for these movements List of Genera and 

 Families, which include sleeping plants Description of the 

 movements in the several Genera Oxalis: leaflets folded at 



