SUBJECT INDEX 



533 



Soil— Continued. 



botany, discussion, (26) 718. 



carbonates, decomposition, (31) 25; (32) 123. 



carbonates, determination, (30) 808; (35) 503: 



(40) 308. 

 catalase, notes, (31) 313. 

 colloids — 



adsorptive power, (34) IS. 



ammonia-soluble inorganic, (31) 801. 



as affected by soluble salts, (35) 622. 



bebavior in presence of soluble salts, (33) 

 324. 



determination, (33) 118. 



importance, (29) 817; (34) 816. 



notes, (30) 513, 718; (32) 318; (35) 512. 



properties, (31) 514. 



relation to plowsole, (40) 417. 



role of, (33) 321, 513. 



studies, (32) 813; (35) 16, 319, 813; (36) 21; 



(37) 520. 

 treatise, (34) 515. 



compactness, effect on root development, (26) 



327. 

 concretions due to manganese or lime, (32) 215. 

 conditions — 



and plant gi-owth, treatise, (39) 512. 



in Selby smoke zone, (35) 213. 



in United States and western Canada, 



handbook,' (29) 596. 

 relation to bacterial activity, (34) 813. 

 constituents — 



and ammonium salts, interaction, (32) 121. 

 :^ semipermeable membranes, (31) 720. 

 assimilation by oats, (31) 632. 

 beneficial, importance, (26) 419. 

 inhibition of plant toxins by, (37) 519. 

 organic, effect on nitrogen fixation by 



Azotobacter, (33) 620, 823. 

 organic, notes, (28) 29. 

 organic, studies, (27) 500. 

 solubility, (30) 221. 

 studies, (28) 324. 

 -containers, effect of paraffin lining, (37) 812. 

 containers for plant culture work, (36) 524. 

 crusts, relation to fertilizers, (31) 123. 

 decoctions, effect on bacteria, (28) 329. 

 depletion, relation to nitrate reduction in 



plant!!, (37) 549. 

 -erosion— 



as affected by forests, (29) 842. 

 by wind, (29) 811; (31) 317. 

 cause and prevention, (30) 625. 

 coast, Spartina for, (40) 530. 

 control, (39) 813. 

 economic waste from, (31) 316. 

 effect of cattle on, (39) 512. 

 in forests, (30) 743. 

 Iowa, (40) 717. 

 Kansas, (38) 422. 



ravines, prevention, (26) 643. ' 



the South, (32) 811. 

 injurious effects, (32) 30. 

 measurement, (31) 24. 

 model for schools, (27) 797. 

 notes, (34) 818, 885. 

 of Sioux Point, S. Dak., (26) 27. 

 on western grazing lands, (39) 439. 

 prevention, (26) 323; (31) 317; (32) 514, 884; 

 (34) 326, 819; (36) 320, 422, 723; (37) 87, 

 286, 520; (40) 188. 

 ■experiments, (27) 393, 394. 

 experiments at New York Cornell Station, 



(29) 820. 

 experiments, standardization, (39) 829. 

 extracts— 



as affected by season and crop growth, 



(38) 813. 



as criterion of productivity, (38) 812; (40) 

 120. 



as indicating chemical needs of soil, (39) 331. 



reaction of, (30) 121. 



ultramicroscopy of, (30) 516. 

 factor in crop centers, (39) 734. 

 fatigue- 

 notes, (29) 243. 



review of literature, (34) 326. 



studies, (30) 426, 624; (33) 31. 



treatment, (37) 421 . 

 fauna, rhizopods and flagellates in, (35) 121. 



Soil— Continued, 

 fertility- 

 accumulation, (32) 121. 

 and agriculture, question summary, (28) 



and fertilizers, treatise, (28) 423. 



and second-growth vegetation, correlation, 



(39) 115. 

 fertility as affected by- 

 alfalfa, (29) 633. 



crop rotation, (27) 821; (39) 424. 

 fertilizers, (34) 517. 

 glaciation, (32) 317. 

 inundation, (30) 213. 

 lime and chalk, (34) 221. 

 manure, (29) 317. 

 organic matter, (39) 725. 

 sulphur, (35) 728. 

 fertility- 

 bacterial theory, (28) 718. 

 conservation and improvement, (27) 818: 



(29) 125. 

 correlation with seasonal rainfall, (39) 511. 

 determination, (26) 21, 123; (27) 417; (31) 



226; (33) 97; (34) 218; (36) 622. 

 dynamic theory, (34) 812. 

 effect on root development, (26) 328. 

 experiments, standardization, (40) 823. 

 factors in, (32) 30. 



improvement, (28) 533; (34) 528; (38) 219. 

 in China, Korea, and Japan, (27) 518. 

 in India, (27) 319. 

 loss by leaching, (36) 725. 

 loss from cropping, (39) 327. 

 maintenance, (26) 423; (27) 124; (28) 533; 



(29) 213, 623; (30) 23, 320, 426; (31) 217, 318, 



819; (32) 31, 725; (34) 516, 520, 621, 722; (35) 



325; (36) 120, 618; (37) 514, 720, 813; (38) 



119; (39) 125, 815. 

 maintenance with nature's fertilizers, (39) 



816. 

 manual, (30) 517. 

 measurement, (36) 510. 

 misconceptions concerning, (33) 721. 

 new views on, (31) 516. 

 notes, (27) 216, 219; (28) 29; (31) 122, 127, 



221; (33) 695; (34) 22, 722; (37) 211, 214. 

 principles, (26) 519; (33) 721. 

 problems, (27) 819. 

 problems in Great Britain, (39) 616. 

 fertility, relation to — 

 bacteria, (34) 619. 

 chemical composition, (33) 421. 

 crystalloids and colloids, (28) 814. 

 dairy farming, (27) 280. 

 earthworms, (27) 518. 

 fertilizers, (29) 213; (30) 821. 

 fungi, (29) 824. 

 humus, (37) 718. 

 lime, (28) 223. 



plant food, (26) 621; (28) 220. 

 plant transpiration, (26) 36. 

 sulphur, (34) 27. 

 weeds, (34) 39. 

 fertility- 

 review of investigations, (26) 123. 

 role of nitrification in, (37) 519. 

 studies, (26) 816; (27) 500; (28) 324; (29) 416, 



728; (31) 620; (36) 814; (37) 214, 626; (39) 



422, 737; (40) 419, 624, 719. 

 testing, (28) 537. 

 treatise, (26) 521. 

 under trees, (38) 816. 

 variation in, (28) 123. 

 work in India, (40) 825. 

 work in Kansas, (40) 319. 

 work in Rhode Island, (38) 325. 

 flora— 



as affected by arsenic compounds, (32) 720. 

 as affected by leaching, (35) 514. 

 nitrogen-fixing powers of, (35) 320. 

 of India, (36) 449. 

 Studies, (37) 516, 517; (38) 514. 

 flows in polar and subpolar regions, (31) 23. 

 formation, relation to animal organisms, (26) 



223. 

 formation, relation to forest cover, (29) 643. 

 forming minerals, microscopic determination, 



(28) 812. 

 Fumigant and Insecticide, tests, (30) 166. 



