TABLE OF CONTENTS 



FIFTH SECTION 

 MOVEMENTS OF IRRITATION 



I. The Movements of Irritation of Protoplasmic Structures 



PAGB 



168. Protoplasmic Movements 417 



169. The Free Locomotion of Lower Organisms (Movements of Swarmers, 



etc.) 423 



170. Movements of Chlorophyll Bodies 431 



171. Movements of the Plasmodia of 2Ethalium Septicum .... 433 



II. Geotropic, Heliotropic, and Hydrotropic Nutations, and some 

 other Phenomena of Irritability 



172. The Geotropic Behaviour of Boots 436 



173. The Geotropic Behaviour of Shoots 441 



174. The Causes of Geotropic Curvatures 446 



175. The Function of the Boot Tip in connection with Geotropic Curva- 



tures 452 



176. Experiments with the Clinostat 453 



177. Experiments with the Centrifugal Apparatus 462 



178. Heliotropic Nutations 467 



179. Heliotropism (continued) 471 



180. The Hydrotropism of Boots 475 



181. The Hydrotropism of Mucor Mucedo 477 



182. Thermotropism 478 



183. Aerotropism and Chemotropism of Pollen Tubes and Fungal Hyphae. 479 



184. Movements of Foliage Leaves and Floral Structures induced by 



Changes in Illumination and Variations of Temperature (Nycti- 



tropic Movements) 481 



185. The Darwinian Curvature, etc 485 



III. The Winding of Tendrils and Twining Plants 



186. Generalities respecting the Winding of Twining Plants . . . 487 



187. Kotating Nutation 488 



188. Free Winding 492 



189. The Mechanics of the Winding of Twining Plants .... 492 



190. Experiments on the Tendrils of the Cucurbitaceee .... 496 



191. Experiments with Tendrils of the Ampelideas 501 



