Index 



475 



Projection of seeds, 383, 384, 385 



Prolamins, 127 



Proliferation, 374, 376 



Propulsion, of water up stems, 215 



Protease, 128 



Protection, 256; adaptations, 257; 

 against winds, 257; against light, 261; 

 against weight of snow and ice, 259; 

 against heat, 265; against dryness, 

 267; against too much water, 271; 

 against parasitic plants, 273; against 

 animals, 274 



Proteins, 106, 126; chemistry, 126; 

 grains, 127 



Proteoses, 127 



Prothallia, 458 



Protista, 448 



Protoplasm; in cells, 22; a real sub- 

 stance, 138; appearance, 139, 140, 143; 

 146; streaming, 140, 141; texture, 141; 

 pictures of, 142; chemistry of, 142, 

 144, 147; lability of, 143; par excel- 

 lence, 143; regulatory power in, 144; 

 physiological properties of, 145; af- 

 fected by external conditions, 147; 

 origin of, 148; organization of, 149; 

 identity in animals and plants, 153, 

 continuity of, 157; named, 159; why 

 separated into cells, 161 ; rejuvenation 

 of, 163; vitality suspended, 164; pro- 

 tection of, 257 



Protoplasmic streaming, 77 



Pteridophytes, 456 



Ptomaines, 103 



Puff-balls, 451 



Pulp of fruits, 398 



Purity of germ cells, 298 



Purposefulness, vii, 11, 12 



Quartered oak, 365 

 Quinine, 125 



Radial structure, 49 



Radium, effects on plants, 251 



Rain, protection, 324 



Rancification, 101 



Reason, 255 



Red Alga;, 289, 447 



Red Snow, 447 



Redness of spring vegetation, 263 



Reduction; in size, 390; division, 285, 

 298, 422; of surface, 271 



Reflex action, 255 



Regulatory power in life, 144 



Regulators of metabolism, 106, 128 



Reindeer Moss, 456 



Rejuvenescence, 163, 367 



Reproduction, 278; asexual described, 

 279; sexual described, 281; in relation 

 to sex, 286; structures, 286; in relation 

 to characters, 293; Mendelian basis, 

 295; balance with vegetation, 301 



Resins, 274 



Respiration; balance, 31; nature, 80; 

 experiment, 81, 82; release of carbon 

 dioxide, 81; absorption of oxygen, 82; 

 vs. photosynthesis, 83, 94, 95; quan- 

 tities, 83; vitiates air, 84; balance with 

 photosynthesis, 84, 85; vs. breathing, 

 85; chemistry, 88; equation, 88; ob- 

 ject, 88; vs. combustion, 89, 90; ma- 

 chinery, 89; release of heat, 90; loss 

 of weight, 91; source of energy, 92; re- 

 lation to fermentation, 100; anaerobic, 

 102; intramolecular, 102; relation to 

 decay, 102; relation to disease, 102; 

 and cell size, 162; and movements, 228 



Respiratory equation, 88 



Resting state, 357 



Resurrection plant, 392 



Reversions, 375 



Rheotropism, 251 



Rockweeds, 289, 447 



Rogues, 438 



Roots; characteristics, 66; as foliage, 71; 

 drown, 87; excretions, 125; structure, 

 165, 195; hairs, 165, 166; anatomy, 

 167; cap, 166; growing point, 166; 

 absorption by, 172; adaptations, 196; 

 morphological modifications, 197; ori- 

 gin of, 196; poisons, 212; pressures ex- 

 erted, 78, 214; prop, 258; shortening, 

 382. 



Rose of Jericho, 392 



Rots, 273, 451 



Rubber, 119 



