CONTENTS vii 



PAGE 



PART V 



55. Special cases ...... .... 248 



56. The orientation of foliage-leaves , 255 



CHAPTER IV 



LOCOMOTORY AND PROTOPLASMIC MOVEMENTS 



PART I. THE CHARACTER AND MECHANISM OF MOVEMENT 



57. General ... . 262 



58. Ciliary movement ... . 264 



59. Gliding movements . . 270 



60. Amoeboid movement ... -275 



61. The mechanics of amoeboid movement . . . 276 



62. Protoplasmic streaming ... . . 283 



63. Pulsating vacuoles ... ... 293 



64. Other protoplasmic movements . . 299 



PART II. THE INFLUENCE OF THE EXTERNAL CONDITIONS UPON LOCOMOTION 



AND UPON PROTOPLASMIC MOVEMENT 



65 . 306 



66. The forms of tactic response to tropic stimuli . 308 



67. The influence of temperature ... . . 313 



68. The influence of illumination . 318 



69. The tropic action of light on freely motile organisms . .321 



70. The photic orientation of chloroplastids . . . . 327 



71. The action of gravitational and centrifugal forces . . 334 



72. Geotactic reactions ... . . 336 



73. Diffuse chemical actions .... . 338 



74. Chemotaxis and osmotaxis ... . 343 



75. Chemotactic and osmotactic repulsion . . . 350 



76. The influence of water .... . -355 



77. Mechanical actions ... . . 357 



78. Galvanotaxis . ...... . 360 



79. Cytotaxis , 364 



CHAPTER V 



THE PRODUCTION OF HEAT, LIGHT, AND ELECTRICITY 



PART I. THE PRODUCTION OF HEAT 



So. General ... 366 



81. The evolution of heat by aerobes . 372 



82. The production of heat by anaerobic metabolism ... . 377 



83. The temperature of the plant under normal conditions . . 379 



