INDEX OF SUBJECTS. 



995 



Page. 



Soil chemistry, discussion 717 



classification, physical principles 4;i4 



compactness, effect on root development. 327 

 constituents, beneficial importance of, 



U.S.D.A 419 



erosion in ravines, prevention 643 



prevention, U.S.D.A 323 



fertility, determination 21, 123 



effect on root development 328 



maintenance, Ohio 423 



principles of, 111 519 



relation to plant food, lU 621 



transpiration.. 36 



review o f investigations 123 



studies 816 



treatise 521 



formation, relation to animal organisms. 223 



granulation , causes 420 



hygroscopicity, determination 220 



improvement, relation to cattle feeding. . 873 



inoculation, methods 372 



natural, notes 723 



status of 520 



moisture as affected by fallowing 421, 533 



determinations, interpreting... 421 



effect on root development 327 



factors affecting 421 



relation to plant growth 420 



nitrogen as affected by legumes 196 



availability 434 



organisms, destruction of cellulose by . . . 825 



phosphates as affected by ignition 803 



solubility 726 



physics, discussion 717 



instruction in 434 



studies 28 



problems in Oklahoma 434 



reaction, importance 422 



samples, collecting and testing, HI 221 



sickness, treatment 322 



solution, relation to plant physiology and 



distribution 422 



treatise 122 



solutions, effect on plant diseases 826 



surveys, discussion 118 



111 519 



in Missouri, Mo 222 



southeast England 1 19 



United States, U.S.D.A 718 



■Wisconsin 221, 812 



papers on 434 



temperatures, factors affecting 29 



ts-^pes, descriptions, U.S.D.A 221 



water, movements of 28 



Soiling, summer, suggestions for, Vt 72 



V. summer silage 574 



Soils, absorption of phosphates by 122 



aeration by earthworms 619 



alkali, bacteriological studies, Colo 616 



improvement 223, 224 



of N iger River basin, analyses ... 318 

 reclamation by drainage, Wyo. . 590 

 ammonia evaporation and transforma- 

 tion in - - 525 



analyses. 26, 127 



arid, mechanical analyses 719 



Page. 



Soils as affected by freezing and heating 018 



nucleic acid 814 



salts 618 



silicic acid in lime 34 



soluble salts, U.S.D..\ . . 216 



atmospheric pressure in 323 



availability of phosphoric acid in 321 



bacteriological tests for 322 



black or chernozem of Russia, investi- 

 gations 812 



calcareous, relation to pineapple chloro- 

 sis, P.R 121 



Catlin's River, analyses 719 



classification 421 



clay, plasticity of 220 



climate, and plant growth, relationship. 516 

 composition as affected by sewage irri- 

 gation 614 



crop adaptations of 718 



cultivated, formation of nitrates in 319 



function of humus in 422 



decomposition of organic matter in, 



Iowa 616 



determination of easily soluble matter. 519 



humus content 406 



outer surface 219 



water capacity 619 



drift, of Norfolk, England 120 



effect on cereals 814 



composition of wheat, Cal 133 



drainage water 619 



quality of wine 813 



root development 328 



evaporation from, under arid conditions 220 

 factors affecting mineral plant food con- 

 tent 814 



ferruginous, relation to grape chlorosis. 245 



fertilizer requirements. Term 422 



forest, animal organisms in 223 



plant food requirements 744 



treatise 338 



frozen, bacterial activities in 816 



content 520 



greenhouse, partial sterilization 815 



gumbo, drainage 892 



hardpan, drainage 892 



heated, germination of seeds in 640 



studies 815 



Houston clay, U.S.D.A 517 



hygroscopic moisture of 218 



importance of mechanical treatment. . . 424 



improvement by timber 140 



Inoculated, tests 521 



isolation of creatinin from 420 



U.S.D.A.... 419 



karroo, analyses 469 



lessons on 392 



lime compounds in 322 



lime-magnesium ratio in "23 



management 422, 717 



marsh, characteristic weeds of 538 



management, U.S.D.A 95 



meadow, phosphoric acid and potash 



requirements 424 



mechanical analyses '219,221 



methods of mechanical analysis 29 



