INDEX 



555 



supplied to the soil, 487; circle, 



529; waste of, 531. 

 nodes, 68. 



nose, adaptation for breathing, 384. 

 nucleus (amoeba), 147. 

 nutrition, 5; digestive organs, 363; 



absorption, 375. 

 nuts, 452. 



O 



oats, 449. 



octopus, 471. 



opsonins, 138. 



orang-utan, 318. 



organic things, 1; likeness of, 6. 



organs, 27, 30; "essential," 112; 

 specialized, 157; homologous, 184, 

 323; rudimentary, 321; digestive, 

 363. 



oriole's nest, 295. 



orthoptera (straight winged), 193. 



Osier, Dr., quoted on alcohol, 519. 



osmosis, definition, 58; dependence 

 of root absorption on, 59; suc- 

 cessive, 61, 64, 65, 363; absorption 

 of food by, 374, 377; and life, 524- 

 526. 



ovary, 109, 113; in frog, 263. 



oviduct, in frog, 263. 



ovules, 109, 113; structure, 114. 



oxidation, 10; of tissue, 382; and 

 life, 526-531. 



oxygen, 10, 11, 17, 18, 19, 91, 98, 

 103; soluble in water, 186; lymph 

 supplied with, 382; plant supply, 

 447; circle, 528; properties demon-- 

 strated by Priestley, 1774, 537. 



oysters, 470; "pearl," 471. 



palate, of man, 365. 

 pancreatic fluid, 374. 

 paper materials, from plants, 459. 

 papillae, 415. 



paramoecium, 148; structure, 149; 



reproduction, 150; parasitic, 150. 



parasites, plant, 127, 129; worms, 



164-167, 468. 

 Pasteur, Louis, 137, 141; wonderful 



services in applied biology, 538, 



539. 



pasteurization, of milk, 141. 

 patent medicines, 444. 

 pea, 35; seed dispersal of, 123. 

 peat, 459. 

 pellagra, 356. 

 penetration (soil), 42. 

 pith, stem, 79, 80. 

 pepsin, 371. 

 phosphates, 14. 

 phosphorus, 14, 15, 17, 531. 

 photosynthesis, process of starch- 

 making in leaves, 96-98; compared 



with respiration, 101, 103. 

 physiology, 1. 

 pigeons, carrier, 306; various races of, 



490. 



pine, seed, 121, 122. 

 pistil, 109. 

 pitch, 461. 

 plants, general uses of, 446, 463; 



breeding of, 488, 489. 

 plasma, 394. 

 pleurisy, 385. 

 plumule, 32, 33. 

 pollen, 109; protection of, 111, 113; 



structure, 114. 

 pollenation, 108, 109; cross, 109,113; 



biology applied to methods of, 488. 

 polycotyledonous (having three or 



more cotyledons), 33; stems, 81. 

 pome, 119. 

 poppy, seed of, 122. 

 posture, 433. 



potassium, 15, 17, 23, 531. 

 pneumonia, 137, 142; effect on 



alcohol users, 519. 

 ptomaine (poisoning), 137. 

 prawns, as food, 472. 

 Priestley, properties of oxygen first 



demonstrated by, 537. 

 primates, 314. 

 propolis, 216. 

 proteids, 20, 21, 23; function of in 



man's food, 343, 344, 436. 



