746 



AUTHORS' INDEX 



Rafter, G. W., Sewage irrigation, 711. 

 Ramann, E., Carbon dioxide in soil air, 

 480. 



Colloid chemistry, 153. 

 Reed, H. S., Oxidation by roots, 407. 



Toxic material in soils, 136. 

 Reid, F. R., Catalysis, 529. 

 Rice, T. D., Reconnoissance, 737. 

 Richthofen, F., Character of loess, 59. 

 Roberts, I. P., Losses of manun 



Production of manure, 587. 

 Robinson, F. R., Lime, 537. 

 Robinson, F. W., Root nodules and 



nitrogen storage, 621. 

 Robinson, T. R., Litmus test, 386. 

 Robinson, W. O., Color of soils, 77. 



Manganese, 531. 

 Rodewald, H., Estimation of colloids, 



168. 

 Rostworowski, S., Absorption by per- 



mutite, 867. 

 Russell, E. J., Plant food elements, 3. 



Classification of particles, 96. 



Classification of soils, 718. 



Crop adaptation and texture, 105. 



Mechanical soil analysis, 103. 



Nitrogen fertilizers, 547. 



Partial sterilization of soils, 470. 



Sewage sick soils, 474. 

 Russell, I. C, Subaenal deposits, 62. 



Sachs, J., Solvent action of roots, 406. 

 Sackett, W. CJ., Ainmonification, 146 



Availability of fertilizers, 511. 

 Salisbury, R. D., Driftless area, 07. 



Glacial geology, 47. 

 Sanborn, J. W., Roots of crops, 81. 

 Sargent, C. L., Acidity tests, 387. 

 Saussure, T. de, Composition of plants, 



490. 

 Schantz, H. L., Water requirements, 

 245, 712. 



Wilting point, 258. 

 Schlicter, C. S., Effective diameter of 



particles, 123. 

 Schone, E., Elutriator, 87. 

 Schreiner, O., Absorption by soil, 351. 



Carbonized material in soil, 141, 144. 



Composition of humus, 134, 136. 



Organic substances in soil, 132. 



Oxidation by roots, 407. 

 Schubler, G., Cohesion test, 175. 

 Schucht, F., Mechanische Bodenunter- 



suchung, 84. 

 Schulze, B., Temperature of soil, 321. 

 Schulze, F., Water extract of soil, 341. 



Schutt, M A., Losses of manure, 583 



599,600. 

 Seelhorst, C. von, Water requir. 



261, . 

 Sheppard, J. H., Roots of crops, 82. 

 Sherman, ('. W , Boil survey of Indiana, 



719. 



mine, 497. 

 Organic sol D soil, 132. 



Shutt. F. T., Nitrogen storage by !<•-:- 



nines, 621. 

 Simniermacher, W , Lime :in<l phos- 

 phates, 536. 

 Skinner, J. J., Creatinine 



Organic matter in soil, 136. 

 Smith, C. I)., Root nodules and nitrogen, 



storage, 621. 

 Smith, H. E., Bacteria in frozen soil, 433. 

 Snyder, H., Ash of humus. 1 l :» 

 Complete solution of soil, 330. 

 Composition of humu.s, 149. 

 Production of humus, I HI 

 Sj)illinau. \V J., «ree:> manures, 619. 

 Stevenson. W. II.. Soil survey of Iowa, 



718. 

 Stewart, -I. B.. Moisture control, 285. 



Capillary movement, 225. 

 Btohman, P., Absorption, 353, 354. 

 Stoklasa, J., Bacteria in soil, 437, 439. 

 Carbon dioxide production, 139. 

 Carbon dioxide production in soil, 



408. 

 Carbon dioxide in soil air, 479, 482. 

 Fermentation and phosphates, 520. 

 Stonr, F. H., Farm manure, 578. 

 Green manure, 619. 

 Humus and capillarity, 219. 

 Poultry manure, 588. 

 Stormer, K., Effect of soil antiseptics, 



MM. 

 Stover, A. P., Carey Act, 688. 

 St rem me. II . Estimation of colloids, 



167. 

 Sullivan, M. X., Catalysis, 529. 



Manganese, 531. 

 Swezey, G. D., Temperature of soil, 321, 

 485. 



Teel, R. P., Losses of irrigation water. 



694. 

 Ten Eyck, A. M., Roots of plants, 81. 

 Thaer, W., Properties of colloids, 153. 

 Thome, C. E., Application of manure 

 607. 

 Cement versus dirt floors, 604. 

 Effect of food on manure, 582. 



