INDEX 



663 



Mutations, 350; of genes, 383 

 Mychorrhiza, 276 



Naegeli, Carl, 15 



Nam family, 54 



Names, scientific, 413 



Natural, fertility of soil, 271; gas, 



44; oil, 27; Selection, theory of, 



421 

 ^ Nature of association of organism, 



193; of death, 249 

 Neanderthal man, 499 (fig.) 

 Negroes, 526 

 Negroid race, 503 

 Mematode worms, 208 

 Neotropical realm, 478 

 Nerve-cells, connecting, 155; 



motor, 153; sensory, 153 

 Nervous activity, 76; control, im- 

 paired, 185; organization, 154; 



prostration, 186; system, 110, 



148, 152 

 Neurasthenia, 186 

 New Lamarckian school, 428 

 Nitrates, 38, 271 

 Nitrifying bacteria, 273 

 - Nitrifying organisms and higher 



plants, 274 

 Nitrogen, 45; cycle, 277 

 Nitrogenous waste, decomposition 



of, 266 

 Nodules, root, 212 

 Non-sexual reproduction, 116 

 Nordic type of man, 502 

 Nostoc, 318 (fig.) 

 Nourishment of the young, 308 

 Nuclear membrane, 20 (fig.), 286, 



289; sap, 20 (fig.), 286, 289; 



spindle, 288 

 Nucleolus, 20 (fig.), 285 

 Nucleus, 20 (fig.), 285; endosperm, 



337 (fig.) 

 Nutrients, 91 



Occupational classes, 522 

 Ocean currents, effect of, 483; dis- 

 tribution of life in -the, 482 

 Oceanic islands, animals of, 476 

 (Edogonium, 321 (fig.), 325 (fig.) 

 Oil, fusel, 263; natural, 27 

 Oils and fats, decomposition of, 266 

 Old age modifications, 253 

 One-celled organisms, 25 (fig.) 

 Orange, seedless, 394; trees, 346 



Order, 413 



Organic substances, 18; wastes, dis- 

 posal of, 259 



Organisms, adjustment of, 6; as- 

 sociation of, 193; colonial, 27; 

 defenses of, 228; growth of, 283; 

 interaction of, 7; interrelations 

 of, 423; multicellular, 24; pro- 

 ducing decomposition, 261; pro- 

 ducing fermentation, 262; pus- 

 forming, 222; unicellular and 

 bottom deposits, 487 



Organization of protoplasm, 48 



Organs, 32; accessory respiratory, 

 100; accessory sex, 298; ex- 

 creting, 61, 104; of flotation, 

 488; of hearing, 143; leaves as 

 absorbing, 59; respiratory, 99; 

 rudimentary, 414; sense, 110; 

 sex, 328 



Oriental realm, 479 



Origin of species, Darwin's, 421 



Orthogenesis, 429 



Orton, Dr. W. A., 395 



Oscillatoria, 317 (fig.) 



Osmotic pressure, 53 



Overproduction, 422 



Ovule, 336, 340 (fig.) 



Oxidases, 68 



Oxidation, 76, 81, 98 



Pain, 137; emotions connected 

 with, 166 



Paired genes, 356 



Paleontology, evidence of evolution 

 from, 408 



Pancreatic hormone, 174; hormone 

 deficiency, 185; juice, 94 



Paper-making, 548 



Paramoecium, 26 (fig.), 135, 148 



Parasite, 27; and hosts, relation of, 

 218; animal, 199; life histories 

 of, 202; malarial, 239; structure 

 of, 201 



Parasitic fungi, 210; plants, 198 



Pasteur, Louis, 262 



Pea seed, structure of, 341 (fig.); 

 heredity of, 351 



Pectinase, 67, 266 



Pelagic many-celled animals, 488 



Pepsin, 94 



Peptones, 268 



Perception, of color, 146; of dis- 

 tance, 146; of form, 144 



