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 manure, 599. 



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, 357. 

 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., Subaerial deposits, 62. 



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

 Sackett, W. G., Ammonification, 446. 



Availability of fertilizers, 511. 

 Salisbury, R. D., Driftless area, 67. 



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. 

 Schiibler, G., Cohesion test, 175. 

 Schucht, F., Mechanische Bodenunter- 



suchung, 84. 



Schul/e, 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 requirements, 



251, 255. 



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

 Sherman, C. W., Soil survey of Indiana, 



719. 

 Shorey, E. C., Creatinine, 497. 



Organic substances in soil, 132. 

 Shutt, F. T., Nitrogen storage by leg- 

 umes, 621. 



Simmermacher, W., Lime and phos- 

 phates, 536. 



Skinner, J. J., Creatinine, 497. 

 Organic matter in soil, 136. 

 Smith, C. D., Root nodules and nitrogen, 



storage, 621. 



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

 Snyder, H., Ash of humus, 145. 

 Complete solution of soil, 330. 

 Composition of humus, 149. 

 Production of humus, 140. 

 Spillman, W. J., green manures, 619. 

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



718. 

 Stewart, J. B., Moisture control, 285. 



Capillary movement, 225. 

 Stohman, F., 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. 

 Storer, F. H., Farm manure, 578. 

 Green manure, 619. 

 Humus and capillarity, 219. " 

 Poultry manure, 588. 

 Stormer, K., Effect of soil antiseptics, 



469. 



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

 Stremme, H., Estimation of colloids, 



167. 

 Sullivan, M. X., Catalysis, 529. 



Manganese, 531. 



Swezey, G. D., Temperature of so", 321, 

 485. 



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



694. 



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

 Thaer, W., Properties of colloids, 153. 

 Thorne, C. E., Application of manure, 



607. 



Cement versus dirt floors, 604. 

 Effect of food on manure, 582. 



