vi CONTENTS. 



gean hypocotyls— Circumnutation of hypocotyls and epicotyle 

 when erect— Cii-cumniitation of cotyledons— Pulvini or joints of 

 cotyledons, duration of their activity, rudimentary in O.xalis 

 coi-niculata, their development — Sensitiveness of cotyledons to 

 light and consequent disturbance of their periodic movements- 

 Sensitiveness of cotyledons to contact Page G7-128 



CHAPTEE III. 



Sensitiveness of the Apex of the Radicle to Contact and 



TO OTHER IkRITANTS. 



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 — ER'ects 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 — Tropgeolum — Gossypium-'-Cucurbita 

 — Raphanus— jE^cuIus, tip not sensitivetoslight contact, highly 

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

 Power of discrimination — Zea, tip highly sensitive, secondary 

 radicles — Sensitiveness of ladicles to moist air — Summary of 

 chapter 129-200 



CHAPTER lY. 



Tub Cibci'mkutatikg Movkments of the several parts of 

 Mature Plants. 



Circumnutation of stems: concluding remarks on — Ciioumnutation 

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

 surrounding plants — Circumnutation of flower-stems — Circum- 

 nutation of Dicotyledonous leaves — Singular oscillatory move- 

 ment i( leaves of Dioniea — Leaves of Cannabis sink at night — 

 Leaves of Gymnospei-ms — Of Monocotyledons — Cryptogams — 

 Ccncluding remarks on the circumnutation of leaves : generally 

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



