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 



6 1. 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 



80. General 3^6 



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 



