SUBJECT INDEX 



443 



Placenta — CoiiUiuied. 



chemical composition, (37) 109. 

 growth-promoting substance in, (40) 566. 

 maternal, experimental production, (27) 174. 

 Flaesius javanus, notes, (35) 57. 

 Plagia americana, notes, (28) 253. 

 Plagia trepida, biology, (36) 858. 

 Plagiodera versicolora, notes, (37) 359; (40) 754. 

 Plagiognathus politus, relation to fire blight, (36) 



351. 

 Plagiolepis longipes, studies, (35) 467; (38) 364. 

 Plagionotus speciosus, notes, (26) 147. 

 IMague— 



bubonic, in camels, (30) 784. 



bubonic, paper on, (26) 245. 



bubonic, transmission by rodents, (27) 754. 



dissemination by rats, (34) 548. 



eradication in cities, (27) 754. 



eradication in Porto Rico, (29) 158. 



flea of Siberia and Manchuria, notes, (26) 252. 



human, in East Suffolk, England, (26) 461. 



human, vaccine for, (37) 378. 



in Hawaii, notes, (26) 854. 



infection in domestic animals, (26) 280. 



infection in rats, (27) 754. 



investigations in India, (26) 653. 



pneumonic, susceptibility of animals to, (28) 



180. 

 relation to— 



fleas, (27) 59, 754. 

 rodents, (34) 355; (40) 161. 

 tarbagans, (27) 454. 



weasels, chipmunks, and pocket gophers, 

 (26) 59. 

 transmission, (33) 456, 552. 

 transmission— 



among marmots, (37) 180, 878. 

 by bedbugs, (33) 747; (38) 559. 

 fleas, (26) 61; (33) 749. 

 insects, (29) 756. 

 tarbagans, (26) 653. 

 Plane tree leaf scorch, notes, (32) 347. 

 Planera aquatica, culture for wild ducks, (33) 251. 

 Plank drag for soils, (32) 789. 

 Plant- 

 activities, relation to soil moisture, (27) 214. 

 activities, relation to sun spots, (38) 114. 

 alkaloids, synthesis of, (31) 409. 

 alkaloids, treatise, (29) 503. 

 anatomy, pathological, treatise, (36) 46. 

 anatomy, treatise, (31) 728; (33) 724. 

 and animal life, treatise, (28) 897. 

 and animal tumors, comparison, (29) 548. 

 antigens, hemagglutinating and precipitating 



capacity of, (26) 607. 

 ashes as source of potash. (37) 427. 

 ashes, composition, (39) 607. 

 associations in western Pennsylvania, (38) 425. 

 associations in wild hay meadow, (32) 329. 

 associations, studies, (31) 35. 

 bases, studies, (31) 309. 

 bases, treatise, (31) 10. 

 Biology Station in France, (28) 498. 

 breeding — 



and seed control, (40) 245. 

 applicability of pure-lime theory, (39) 573. 

 at Svalof, Sweden, (31) 830. 

 at Tystofte, (30) 134. 

 bibliography, (28) 145. 

 color transmission in, (39) 734. 

 cooperative, in Wisconsin, (28) 593. 

 experiments, see also special crops. 

 experiments, (27) 343, 528, 734, 741; (31) 829. 

 breeding experiments— 



at Svalof. Sweden, (30) 435. 

 control of stray pollen in, (38) 430. 

 error in, (30) 525; (39) 830, 831, 832. 

 personal equation in, (26) 734. 

 spacing in, (35) 437. 

 breeding— 



for disease resistance, (30) 331; (40) 344. 

 genetic and environmental factors in, (30) 



329. 

 heterozygosis in, (27) 428; (29) 31. 

 in Canada, (34) 40. 

 Dahlem. (34) 727. 

 Europe, (27) 239. 

 Germany, (30) 525. 

 Germany, treatise, (26) 43. 

 Italy, (37) 827. 



Plant— Continued. 



breeding— continued. 



in North .Vinerica, (27) 239. 



Scandanavia, handbook, (29) 636. 

 Sweden, notes, (26) 839. 

 Uruguay, (39) 835. 

 instruction in, (28) 393. 

 methods, (27) 342; (39) 444. 

 notes, (28) 43.i. 

 physiological correlations and climatic 



reactions in, (31) 629. 

 plats, management, (29) 636. 

 plats, standing room of plants in, (30) 632. 

 principles of, (30) 732. 

 review of investigations, (38) 367. 

 review of literature, (28) 536; (29) 830 

 rod-row tests, (38) 429. 

 selection in, (30) 732. 

 selection problem in, (38) 64. 

 station at University of Halle, (28) 736 

 studies, (39) 746, 747. 

 teaching, (26) 162. 

 textbook, (39) 671; (40) 817. 

 theory of cryptomerv, (29) 434. 

 theory of factors, (29) 433. 

 treatise, (26) 325; (28) 730; (31) 131; (32) 220, 



425, 430, 822. 

 work of Luther Burbank, treatise, (32) 143. 

 bug, tarnished, sec Tarnished plant bug. 

 bugs, notes, (28) 752. 

 catalase, physiology of, (26) 803. 

 cell bodies and mitochondria, differentiation, 



(39) 730. 

 cell membranes, chemistry and structure, (34) 



626. 

 cell reactions in relation to aphids, (32) 553. 

 cell substances, electric charge of, (34) 525. 

 cells— WRJ I^IW 



absorption of uranium by, (27) 826. 



acidity, (37) 430. 



as affected by electrolytes, (27) 732. 



assimilation of nitrates in, (27) 332. 



changes in during fermentation, (36) 802. 



chondriosomes in, (29) 217. 



chromosome number, (40) 817. 



entrance of coloring matters into, (27) 632. 



formation of starch in, (27) 133. 



intake of material by, (34) 333. 



labile albuminous body in, (36) 225. 



metachromatin in, (40) 325. 



mitochondria in, (40) 425, 818. 



mutation in, (36) 222. 



nitrogen assimilation in, (28) 428. 



permeability, (29) 627, 628; (37) 128, 326, 



431, 632. 

 permeability as affected by electrical stim- 

 ulus, (36) 732. 

 permeability in relation to temperature 



and acidity, (35) 224. 

 physical-chemical analysis, (29) 408. 

 protein synthesis in, (28) 428. 

 protoplasm of, (34) 33. 

 reaction to plant lice, (33) 444. 

 reduction oxidation regions in, (34) 33. 

 reserve albuminous bodies in, (35) 332. 

 role in sap ascent, (27) 829; (34) 727. 

 role of chondriome in, (40) 223, 323. 

 size and shape, (39) 226. 

 size in relation to mutational characters, 



(40) 323. 

 synthesis, (27) 464. 



turgescence and water absorption, (39) 731. 

 characteristics, relation to seed weight, (29) 



522; (31) 824. 

 chemistry, progress in, (29) 408. 

 chimeras, notes, (32) 726; (33) 429; (40) 826. 

 chlorosis — 



in nutrient solutions, (36) 633. 

 investigations, (28) 425. 

 notes, (34) 720. 



relation to soil alkalinity, (30) 50. 

 chromosomes, see Chromosomes, 

 colloids, studies, (35) 501. 

 coloring matters, chemistry, (27) 310. 

 communities, ecological classification, (39) 28. 

 competition, studies, (40) 424. 

 constituents, humification, (35) 627; (38) 26, 27. 

 cover, relation to soil acidity, (27) 29. 

 culture, treatise, (35) 499. 



