VI CONTENTS. 



gean hypocotyls — Oircumnutation of hypocotyls and epicotyls 

 when erect — Circumnutation of cotyledons — Pulvini or joints of 

 cotyledons, duration of their activity, rudimentary in Oxalia 

 oomiculata, their development — Sensitiveness of cotyledons to 

 light and consequent disturbance of their periodic movements — 

 Sensitiveness of cotyledons to contact ' Page 67-128 



OHAPTEE III. 



Sensitiveness of the Apex of the Radicle to Contact and 



TO OTHER IkEITANTS. 



Manner in which radicles bend when they encounter an obstacle in 

 the soil — Vicia faba, tips of radicles highly sensitive to con- 

 tact and other irritants — Effects of too high a temperature — 

 Power of discriminating between objects attached on opposite 

 sides — Tips of secondary radicles sensitive — Pisum, tips of 

 radicles sensitive — ^Effects of such sensitiveness in overcoming 

 geotropism — Secondary radicles — Phaseolus, tips of radicles 

 hardly sensitive to contact, but highly sensitive to caustic and 

 to the removal of a slice — Tropseolum — Gossypium — Cucurbita 

 — Eaphanus— jEpcuIus, tip not sensitive to slight contact, highly 

 sensitive to caustic — Quercus, tip highly sensitive to contact — 

 Power of discrimination — Zea, tip highly sensitive, secondary 

 radicles — Sensitiveness of radicles to moist air — Summary of 

 chapter 129-200 



CHAPTEE IV. 



The CiROUMNnTATiNG Movements op the several parts of 

 Mature Plants. 



Oircumnutation of stems: concluding remarks on — CiroumnutatioD 

 of stolons : aid thus afforded in winding amongst the stems ol 

 surrounding plants — Circumnutation of flower-stems — Oircum- 

 nutation of Dicotyledonous leaves — Siugular oscillatory move- 

 ment ii leaves of Dionsea — Leaves of Cannabis sink at night 



Leaves of Gymnosperms — Of Monocotyledons — Cryptogams— 

 Ccncluding remarks on the circumnutation of leaves ; generally 

 lise in the evening and sink in the morning ,. .. 201-262 



