xvi TABLE OF CONTENTS 



PAGE 



In Pteridophyta . 241 



In Spermaphyta .... . 242 



Vegetative organs ... . 242 



Leaves of Sagittaria .... . 242 



Leaves of Campanula , . . 242 



Reproductive organs ... ... 242 



Formation of flower dependent on light . . 242 



(b) Flattening and increase of surface of organs in relation 



to light 245-250 



In roots of Orchideae ....... 246 



In roots of Podostemaceae ... . 247 



In shoots of Cacteae and other plants . . . 247 



In Pteridophyta . . . 249 



In Bryophyta ... . 249 



In Algae . 249 



(c) Anisophylly in relation to light 250-255 



In Abies pectinata . 250 



In Lycopodium complanatum 252 



In Goldfussia and other dicotyledonous plants . . 253 



(d) Change of function through light 255-257 



In Circaea ......... 256 



In Algae 256 



(e) Influence of light upon the relationships of configuration 



of the Fungi 2 57~259 



C. Influence of the medium ... 259-268 



1. Influence of water and air-moisture 260 



A. Aquatic and amphibious plants 260 



B. Induction of resting states through drought . . . 261 



C. Formation of tubers in Juncus and in Poa bulbosa . 262 



D. Formation of thorns and prickles 263 



E. Succulence of the leaf ....... 264 



2. Halophilous plants 265 



3- Fungi 266 



D. Mechanical stimuli 268-270 



