636 



Ripley, H. D., 221 



Robbins, Herbert C, 212 



Robbins, William Jacob, 17, 27, 37, 



380-390 

 Robinson, B. L., 3, 217 

 Rodgers, Andrew Denny, III, 18, 28, 



467^70 

 Rolland, A. E., 215 

 Rollins, Reed C, 192-208, 220 

 Rose, J. N., 224 

 Rotenone, 505 

 Rothrock, J. T., 216 

 Rousseau, Jacques, 18, 28 

 Rusby, H. H., 228, 234, 237, 241 

 Rusts, 50, 62 



flax, 73 



grasses, 69 



oats, 73 



wheat, 50-62 



white pine blister, 76 

 Rydberg, Per Axel, 218 



Sachs, Julius, 403 



St. Hilaire, A. F. C. P. de, 237 



St. John, Harold, 215, 243 



Sandeman, Christopher, 236 



Sandwith, N. Y., 230 



Sargent, C. S., 3 



Sarton, George, 468 



Sax, Karl, 18, 28 



Schery, Robert W., 225 



Schlim, L. J., 228 



Schomburgk, Richard, 230, 245 



Schomburgk, Robert, 230, 245 



Schott, H. W., 237 



Schultes, Richard E., 233, 234, 244 



Schunke, Carlos, 235 



Scribner, F. L., 3 



Scroggan, Homer J., 215 



Sears, Paul B., 18, 19, 359-366 



Seeds, life span of, 380 



Ught sensitivity in germination of, 626 



physiology of, 624 

 Seibert, R. J., 225, 244, 545-549 

 Sellow, F., 237 

 Senn, H. R., 215 

 Serum diagnosis, 587 

 Setchell, W. A., 4, 242 

 Seward, A. C, 613 

 Sex in plants, evolution of, 475 



INDEX 



Sex hormones in plants, 476 



Shantz, Homer Leroy, 18, 29 



Sharp, A. J., 218, 222 



Shreve, Forrest, 220 



Sigafoos, Robert S., 211, 212 



Simmons, H. G., 215 



Sinnott, Edmund Ware, 11, 18, 29, 118- 



129 

 Size of trees in rain forest, 284 

 Skoog, Folke Karl, 18, 29 

 Small, John Kunkel, 217, 225 

 Smith, A. C, 230, 233, 235, 241, 242 

 Smith, E. C, 215 

 Smith, E. E., 236 

 Smith, E. W., 9 

 Smith, Erwin, 233, 622 

 Smith, Gilbert Morgan, 18, 29, 471-483 

 Smith, J. Donnell, 3, 222 

 Smith, Lyman B., 241 

 Smith, Stanley J., 219 

 Smut of wheat, 57, 59 

 Sodiro, Luis, 234 

 Soil-plant relationships, 367 

 Soil sterilants, 412 

 Spetzman, Lloyd, 213 

 Spoehr, Herman A., 625 

 Sponsler, O. L., 625 

 Spruce, Richard, 228, 234-237, 244 

 Squires, Roy W., 228 

 Stahel, Ceroid, 231 

 Stakman, E. C, 18, 30, 61-77 

 Standley, Paul C, 222-224 

 Statistics, 247 



use in botany, 618 

 Stearn, William T., 226 

 Stebbins, G. Ledyard, 18, 30, 166-191 

 Steere, William C, 11, 212, 243 

 Stehle, H., 227 

 Steinbach, J., 237 

 Stevenson, John Albert, 18, 30 

 Steward, F. C, 624 

 Stewart, Charles D., 464 

 Steyermark, J. A., 219, 223, 224, 229, 



243, 245 

 Strasburger, Eduard, 446 

 Streptomycin, 447 



production by fermentation, 45 

 Succession, 330 



concept of, 332, 347 



ecological, 248 



