CONTENTS. ■^11 



CHAPTER V. 



Modified Cibcuhndtation : Climbing Plants ; Epinastio and 

 Hyponastio Movements. 



OircumQutation 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 — Hyponastio 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 hyponasfcy — 

 Epinastio growth and circumnutation of the flower-peduncles of 

 Trifolium repens and Oxalis carnosa Page 263-279 



CHAPTEE VI. 



Modified Cieodmnutation : Sleep or Nyctitkopic Movkmexts, 

 THEIR Use: Sleep of Cotyledons. 



Preliminary sketch of the sleep or nyctitropio movements of leaves 

 — Presence of pulvini — The lessening of radiation the final cause 

 of nictritropio movements— Manner of trying experiments on 

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

 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 — Despription of the nyctitropio 

 position and movements of the cotyledons of various plants — 

 List of species — Concluding remarks — Independence of the 

 nyctitropio 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. 



MouiFiED Ciecumnutation : Nyctitkopic 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 



