132 MISC. PUBLICATION 2 81, U. S. DEPT. OF AGRICULTURE 

 Robinson, W. O. (2408) 



METHOD AND PROCEDURE OF SOIL ANALYSIS USED IN THE DIVISION OF SOIL 



chemistry and physics. U. S. Dept. Agr. Circ. 139, 20 pp. 1930. 



Romell, L. G. (2409) 



comments on raunkiaer's and similar methods of vegetation analysis 

 and the "law of frequency." Ecology 11: 589-596. 1930. 



Rost, C. 0., and Pinckney, R. M. (2410) 



COLORIMETRIC METHODS FOR THE DETERMINATION OF READILY AVAILABLE 



phosphorus in soils. Jour. Amer. Soc. Agron. 24: 377-395. 1932. 



Sackett, W. G., and Stewart, L. C. (2411) 



A bacteriological method for determining mineral soil deficiencies 

 by the use of the soil plaque. Colo. Agr. Expt. Sta. Bull. 375, 36 pp., 

 illus. 1931. 



Salmon, S. C. (2412) 



THE POINT BINOMIAL FORMULA FOR EVALUATING AGRONOMIC EXPERIMENTS. 



Jour. Amer. Soc. Agron. 22: 77-81, illus. 1930. 

 Sampson, A. W. (2413) 



THE QUADRAT METHOD AS APPLIED TO INVESTIGATIONS IN FORESTRY. Nebr. 



Univ., Forest Club Ann. 6: 11-31, illus. 1915. 

 Sarvis, J. T. (2414) 



APPLICATION OF AGRONOMIC METHODS IN RANGE RESEARCH. Ecology 11: 



777-782. 1930. 



Sayre, J. D. (2415) 



a recording atmometer. Ecology 9: 123-125. 1928. 



Schreiner, O., and Failyer, G. H. (2416) 



CALOMETRIC, TURBIDITY, AND TITRATION METHODS USED IN SOIL INVESTIGA- 

 TIONS. U. S. Bur. Soils Bull. 31, 60 pp., illus. 1906. 



Shaw, C. F. (2417) 



AN IMPROVED METHOD OF MEASURING SOIL COLOR. Soil Sd. 33: 183-185, 



illus. 1932. 



(2418) 



the storie index method of soil evaluation. Amer. Soil Survey Assoc. 

 Bull. 15: 10-11. 1934. 



Shelford, V. E., and Kunz, J. (2419) 



USE OF PHOTOELECTRIC CELLS FOR LIGHT MEASUREMENT IN ECOLOGICAL WORK. 



Ecology 10: 298-311, illus. 1929. 

 Shippy, W. B. (2420) 



AN INEXPENSIVE AND QUICKLY MADE INSTRUMENT FOR TESTING RELATIVE 



humidity. Bot. Gaz. 67: 152-156. 1929. 

 Shirley, H. L. (2421) 



A METHOD FOR STUDYING DROUGHT RESISTANCE IN PLANTS. Science (n. S.) 79: 



14-16, illus. 1934. 

 Shoemaker, D. A. (2422) 



A PROPOSED REVISION OF STANDARDS FOR DETERMINING DENSITY OF HERBA- 

 CEOUS plant cover. Jour. Forestry 30: 1012-1013. 1932. 



Shorey, E. C. (2423) 



SOME METHODS FOR DETECTING DIFFERENCES IN SOIL ORGANIC MATTER. U. S. 



Dept. Agr. Tech. Bull. 211, 28 pp. 1930. 

 Shrive, J. W. (2424) 



AN IMPROVED NONABSORBING POROUS-CUP ATMOMETER. Plant World 18: 



7-10, illus. 1915. 

 Smith, A., and Flint, F. W. (2425) 



SOIL MOISTURE DETERMINATION BY THE ALCOHOL METHOD. Soil Sci. 29 (2): 



101-107. 1930. 

 Smith, E. G. (2426) 



RAUNKIAER'S "LIFE-FORMS" AND STATISTICAL METHODS. Jour. EcologV 1: 



16-26. 1913. 



