XIV CONTENTS. 



PAGE 



Experiments with Sundew ; Responses to Various Stimuli ; 



Mode of Curvature of the Tentacles 25Q 



Chemical Stimuli ; Transmission of Stimulus ; Direct and 



Indirect Stimulation ... . 251 



Haptotropism of Stamens and Stigmas ; Stamens of Berberis and 



of Centaurea ; Stigma of Mimulus 252 



Nyctitropic Movements of Foliage and Floral Leaves ... ... 255 



Temperature Effects in Tulip and Crocus Flowers ; After- 

 effects of Temperature Changes ... ... ... ... ... 256 



Opening and Closing of Composite Flower-heads ; Effects of 



Continued Darkness, and of Temperature and Light Changes 256 



Sleep Movements of Non-pulvinate Leaves ; Movements of 



Pulvinate Leaves ... ... ... ... ... ... ... 257 



Experiments with Clover and with Wood Sorrel ... ... ... 258 



General Experiments with Phaseolus ; Influence of Gravitation ; 

 Influence of Gravitation and Darkness : Autonj^ctitropic 

 and Geonyctitropic Movements ; Structure of Pulvinus of 

 Phaseolus Leaf 259 



CHAPTER VIII. 



ALGAE. 

 Chlamydomonas . . . ... ... ... ... ... ... ... 261 



Sphaerella (Haematoooccus) 263 



Pleurococcus ... ... ... ... ... ... ... ... 263 



Spirogyra : Occurrence ; Culture Methods ; Structure of living 

 Spirogyra Cell ; Cell treated with Iodine, etc. ; Plasmolysis ; 

 Conjugation; Zygospore ... ... ... ... ... ... 264 



Vaucheria : Occurrence ; Culture Methods ; Structure of 

 Thallus ; Asexual Reproduction by Zoogonidia ; Sexual 



Organs 269 



Oedogonium : General Characters ; Culture Methods to induce 

 Formation of Asexual and Sexual Organs ; Structure of 

 Thallus ; Zoogonidia ; Oogonia ; Androgonidia ; Dwarf 



Male Plants 273 



Fucus : General Characters ; Material for Study ; Mucilage in 

 Thallus ; Structure of Thallus ; Air Bladders ; Growth in 

 Thickness ; Sterile Conceptacles ; Sexual Organs and Cells ; 

 Structure of Conceptacles ; Fertilisation ... 276 



