702 



INDEX 



Plants — Continued 



needed by, 154-155 ; relations be- 

 tween animals and, 282-284 ; reproduc- 

 tion of, 83-85, 119, 201-202, 202- 

 203, 204, 611-616; responses of, 422- 

 423; society of, 298-300; success in 

 life of seed, 100-111 ; take food from 

 soil, 137-140 ; used as food, 520-528 ; 

 why modified, 172-173 



Plasma, blood, 383 



Platyhelminthes, 228 ; classification of, 

 228 



Pleura, 406 



Pleurococcus, 201 



Plumcot, how produced, 671 



Plumule, of bean, 117 



Pocket garden, 140-141, 142 



Poison ivy, 106 



Pollen, 83-84; carried by insects, 88- 

 90 



Pollen grain, development of, 616; ger- 

 mination of, 84, 86 



Pollination, agents causing, 88-90 ; arti- 

 ficial, 634 ; cross, 56, 88 



Polycotyledons, 126, 127 



Pons, position of, 432-433 



Porifera, characteristics, 223 ; classifica- 

 tion, 223 



Portal circulation, 378, 398 



Posture, 320 ; importance of, 321 



Potato beetle, 77, 562 



Potential energy, 313 



Precipitins, antibodies, 390 



Preservatives, and bacteria, 459-460 ; 

 harmful, 460 ; salt, 459-460 ; sugar, 

 459 



Pressure, blood, 399 ; osmotic, 148 ; 

 root, 149 ; sense of, 430 



Primary root, 140 



Primates, 270 



Proboscis, 59 



Products, stored, damaged bv insects, 

 565-566 



Professions, abilities needed for, 647; 

 agriculture, 651-652 ; forestry, 652 ; 

 health work, 650 ; medicine, 649- 

 650 ; research worker, 653 ; teach- 

 ing, 651 



Progressive development, 665-667 



Pronuba moth, pollination of yucca by, 

 94 



Propagation, artificial, of fishes, 591- 

 592; vegetative, 612-616 



Protection, of birds, 594-597 



Protective resemblance, of insects, 80, 

 81 



Protein requirement, by body, 340 



Proteins, 31 ; amount needed daily, 

 340; digestion in man, 369, 371- 

 372, 374 ; food rich in, 327 ; made by 

 green plants, 161-162 ; not all good 

 tissue builders, 329-330; test for, 

 119 ; use of, 329-330 



Protoplasm, characteristics of, 39 ; dis- 

 coveries of, 657-659 ^ 



Protozoa, classification, 222 ; habitat of, 

 217 



Protozoan disease, malaria, 483-486 ; 

 other, 486-487 



Protozoans, direct uses of, 542 



Pteridophyta, 180 ; classification of, 205 ; 

 ferns, 204-205 



Ptomaines, 476 



Ptyalin, an enzyme, 365 



Public hygiene, 508 



Pulmonary circulation, 397-398 



Pulse, 399 



Pulvinus, use to leaf, 424-425 



Pupa, of butterfly, 67 



Pure culture, of bacteria, 182 



Pure Food and Drugs Act, 326, 348- 

 349 ; how does it work, 355-357 ; re- 

 quirements of, 350 



Pus, cause of, 317 



Pylorus valve, of stomach, 370-371 



Quarantine, by board of health, 508- 



509 ; why necessary, 471-473 

 Quetelet's Curve, 632 



Rabies, treatment for, 480-481 



Rainfall, affected by trees, 574-577 



Ratio, nutritive, 340 



Rats, harm done by, 545-546 ; spread 

 diseases, 491-492 



Reactions, to stimuli, 39-42, 422-426 



Realms, ecological, 309-310 



Receptacle, of flower, 83, 84 



Recessive characters, 621, 630-631; 

 extracted, 622 



Red blood corpuscles, 387 



Redi, work to show how life begins, 657- 

 658 



Reduction division, of germ cells, 627, 

 630 



Reed, Walter, investigator of yellow 

 fever, 487, 664 



Reflex, arc, 432 ; conditioned, 443 ; 

 importance of, 431-432 ; meaning of, 

 428 ; nature of, 432 



Regeneration, earthworms, 614 ; of flat- 

 worm, 612 



Rennin, enzyme in gastric juice, 371 



Reproduction, 45; by budding, 191, 

 614; by grafting, 613-614; cell di- 

 vision, 48, 612-613 ; in Paramecium, 

 221-222 ; of birds, 618-619 ; of cray- 

 fish, 235-236 ; of earthworm, 231 ; 

 of fern, 204-205; of fish, 247-248; 

 of frog, 252-254 ; of living things, 

 611-617; of mammals, 619-620; of 

 molds, 199; of mosses, 202-203; of 

 plants, 83-88, 615-616; of Spirogyra, 

 201-202, 615; regeneration, 612, 613, 

 614 ; sexual, 615-616 ; vegetative 

 propagation, 613-614 



