vi CONTENTS. 



gean hypocotyls — Circumnutation of liypocotyls and epiootyls 

 when erect — Circumnutation of cotyledons — Pulvini or joints of 

 cotyledons, duration of their activity, rudimentary in Oxalis 

 corniculata, their development — Sensitiveness of cotyledons to 

 light and consequent disturbance of their periodic movements — 

 Sensitiveness of cotyledons to contact Page 67-128 



CHAPTEK III. 



Sensitiveness of the Apex of the Radicle to Contact and 



TO OTHEE lllRlTANTS. 



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 — Gossypiuin — Cucurbita 

 — Eaphanus— Jifculus, 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 ClEClMNDTATlXQ MoVEMESTS OF THE SEVERAL PARTS OF 



Mature Plants. 



Circumnutation of stems: concluding remarks on — Circumnutation 

 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 jf leaves of Dionsea — Leaves of Cannabis sink at nio-ht 



Leaves of Gymnosperms— Of Monocotyledons— Cryptogams— 

 Concluding remarks on the circumnutation of leaves : generally 

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



