SUBJECT INDEX 



85 



Bibliograpliy of— Continued, 

 plant— continued. 



succession, (32) 128; (37) 434. 



tissue, killing by low temperature, (35) 234. 

 plants as affected by — 



coal tar vapors, (27) 636. 



distilled water, (31) 730. 



freezing, (31) 34. 



light and shade, (30) 430. 



salts, (31,1 426. 



smoke and dust, (31) 34. 

 plants- 

 immunity to their own poisons, (32) 35. 



nutrition and reproduction in, (28) 224. 



poisonous, (26) 327. 



poisonous, of California, (32) 778. 



poisonous to livestock, (37) 688. 



-useful in dye making, (29) 626. 



woody, (26) 240. 



woody, of German East Africa, (29) 643. 



woody, of Switzerland, (35) 843. 

 ■Plasmodiophoraceae, (31) 145. 

 Pleurotus spp., (28) 852. 

 plum borer. (33) 454. 

 plum brown rot, (34) 445. 

 plum cureulio, (27) 864. 

 plums, (27) 40. 

 plums, American, (32) 837. 

 Plusia gamma, (26) 147. 

 pneumonia in lower animals, (30) .580. 

 poliomyelitis, (39) 187. 

 pollen of red clover, (29) 829. 

 pollination, (29) 437. 

 pollination — 



in Compositae, (34) 727. 



in field crops, (36) 527. 



of pomaceous fruits, (29) 54L 



of red clover, (33) 833. 

 polyhedra in insects, (37) 254. 

 Polyporus dryadeus, (30) 354. 

 pomology, (.33) .537. 

 potash, (31) 321; (.32) 126. 

 potash- 

 deposits in United States, (31) 125. 



from alunite, (39) 728. 



from blast furnaces, (36) 625. 



from blast furnaces and cement works, (40) 

 128. 



from complex mineral silicates, (39) 218. 



industry, (26) 316. 



production in 1917, (40) 725. 



resources of Uniited States, (36) 26. 



salts, (33) 625; (.35) 23. 

 potassium, determinatioiL, (39) 714. 

 potato^ 



bacterial rots, (26) 847. 



diseases, (26) 547; (30) 649; (31) 51. 



dry rot, (29) 48. 



flea beetle, (29) 25S. 



insects (33) 352. 



late blight, (27) '545,- (31) 246; (39) 651. 



leaf-roll, (27) 448; (28) 52, 848; (30) 243; (32) 

 643. 



powdery scab, (31) 149. 



Rhizoctonia disease, (32) 147. 



scab, (32) 147, 547. 



silver scurf, (29) 347. 



tuber moth, (36) 658. 



tuber rots, (34) 246. 



wart disease, (26) 448. 

 poultry, (26) 669; (28) 599; (33) alT,. 

 poultry investigations, (27) 675. 

 poultry raising, (38) 776. 

 powdery mildews, (30) 537. 

 prairie dogs, (34) .58. 



pregnancy in domestic animals, (35) 880. 

 premature fall of flower petals, (27) 230. 

 protein hydrolysis products, (28) 168. 

 protein metabolism, f26) 764; (28) 167. 

 proteins, (2-1) 801; (38) 708. 

 proteins, digestion by serums, (.35) 179. 

 protoocephalidae. (32) 854. 

 protist organisms, infective granule in, (30) 577. 

 protozoa — 



in ru^^inants' stomachs, (30) 578. 



intestinal, (40) 187. 



pathogenic, (26) 246, 865; (27) 460, 551. 

 pruning, (36) .536. 

 Psyllidae of New World, (31) 453. 

 Puccinia dispersa, (29) 346. 



Bibliography of— Continued. 

 Puccinia graminis, (33) .345. 

 puerperal diseases in cattle, (34) 386. 

 pulp and paper industry, (29) 119. 

 pumping machinery, (31) 89. 

 pure cultures of amebae, (26) 375. 

 purple scale, (26) 757. 

 putrefaction of meat, etc., (34) 164. 

 quassia, insecticidal value, (38) 56. 

 quebracho, (36) 745. 

 Quercus alba, ray system, (40) 153. 

 race hygiene, (27) 70. 

 radioactivity of soils and waters, (33) 809. 

 radishes, (.34) 532. 



rafBnose, physiological behavior, (37) 572. 

 railroad ties, preservation, (28) 240. 

 railroads, agricultural development work, (40) 



488. 

 rainfall, {?.i) 209. 

 rainfall, tropical, (37) 17. 

 rats, (40) 546. 



ray tracheids, in conifers, (28) 440. 

 reclamation of sand dunes, (26) 223. 

 red handed thrips, (28) 354. 

 red peppers, (29) 264. 

 red scale, (26) 554. 



red spider, (29) 262; (32) 158; (36) 557. 

 Reduviidae of North America, (30) 55. 

 reproduction in relation to vegetative vigor in 



plants, (34) 824. 

 respiration of fruits and plant tissues in gases, 



(29) 539. 

 rest period in— 



plants, (32) 437; (35) 222. 



potatoes, (32) 130. 



seeds, (;«) 521. 

 Rhamnus purshiana, (32) 46. 

 Rhizoctonia, (34) 841; (.35) 749. 

 Ribes pallidum, fertility, (31) 225. 

 rice sclerotial disease, (30) 244. 

 rice smut, (35) 247. 



rinderpest, (30; 683; (35) 487; (36) 779. 

 ripening processes of fruits, (26) 139. 

 roads, (28) 486. 

 roads- 

 bridges, and culverts, (35) 583. 



construction and maintenance, (37) 695. 



in United Kingdom, (31) 289. 



in United States, (37) 188. 

 roaring in horses, (26) 185. 

 Rocky Mountain spotted fever, (27) 480, 866. 

 root- 

 knot, (26) 343. 



nodules in Podocarpineae, (27) 828. 



systems of agricultural plants, (36) 827. 



tubercles, (.36) 848. 



tumors, (31) 841. 

 roots of herbaceous plants, (36) 223. 

 rope and its use on the farm, (30) 591. 

 rose aphids, (32) 848. 

 rose leafhopper, (39) 62. 

 rose scale, (33) 557. 

 roses, (27) 146. 

 rotation of crops, (34) 337. 

 roundworms, parasitic in pigs, (28) 288. 

 roup in fowls, (38) 890. 

 rubber, (27) 647; (39) 51. 

 rubber- 

 chemistry, (30) 313. 



industry of the East, (33) 543. 



Manihot, (30) 146. 



root disease, (27) 854. 

 rum, (26) 613. 

 rumpless fowls, (26) 573. 

 rural — 



church, community service, (40) 390. 



communities, (32) 389. 



economics, (26) 92; (28) 492, 795; (U) 894; 

 (.32) 194; (35) 588. 



life, (30) 197, 496, 695. 



life and education, (31) 193; (33) 95. 



migration in France, (35) 497. 



problems, (40) 292, 387. 



social science, (26) 297. 



social surveys, (36) 288. 



sociology, (32) 194, 488. 

 rusts, (30) 3.50. 

 rusts, propagation, (27) 746. 

 rutting of cows, (26) 367. 

 saccharin, (26) 257. 



