RANGE BIBLIOGRAPHY 133 



Smith, F. B., Brown, P. E., and Schlots, F. E. (2427) 



A COMPARISON OF THE NIKLAS AND TRUOG METHODS FOR THE DETERMINATION 



of available phosphorus in soils. Jour. Amer. Soc. Agron. 24: 452-459. 

 1932. 



Snider, H. J. (2428) 



A COMPARISON OF METHODS FOR DETERMINING THE AVAILABILITY OF PHOS- 

 PHORUS. Jour. Amer. Soc. Agron. 24: 680-685. 1932. 



Snyder, E. F. (2429) 



METHODS FOR DETERMINING THE HYDROGEN-ION CONCENTRATION OF SOILS. 



U. S. Dept. Agr. Circ. 56, 30 pp., illus. 1928. 



Stark, O. K., and Whitfield, C. J. (2430) 



an improved evaporimeter. Ecology 11: 282-292, illus. 1930. 



Steinberg, R. A. (2431) 



AN APPARATUS FOR GROWING PLANTS UNDER CONTROLLED ENVIRONMENTAL 



conditions. Jour. Agr. Research 43: 1071-1084, illus. 1931. 

 Stewart, G., and Hutchings, S. S. (2432) 



THE POINT-OBSERVATION-PLOT (SQUARE-FOOT DENSITY) METHOD OF VEGETATION 



survey. Jour. Amer. Soc. Agron. 28: 714-722. 1936. 

 and Keller, W. (2433) 



A CORRELATION METHOD FOR ECOLOGY AS EXEMPLIFIED BY STUDIES OF NATIVE 



desert vegetation. Ecology 17: 500-514. 1936. 

 Thone, F. (2434) 



RAINPROOFING VALVES FOR ATMOMETERS: A RESUME. Ecology 5: 408-414, 



illus. 1924. 

 Toumey, J. W., and Stickel, P. W. (2435) 



A NEW DEVICE FOR TAKING MAXIMUM AND MINIMUM SOIL TEMPERATURES IN 



forest investigations. Ecology 6: 171-178, illus. 1925. 



United States Department of Agriculture, Bureau of Soils. (2436) 



methods of the mechanical analysis of soils and of the determination 



OF THE AMOUNT OF MOISTURE IN SOILS IN THE FIELD. U. S. Bur. Soils 



Bull. 4, 24 pp., illus. 1896. 

 Weaver, J. E. (2437) 



THE QUADRAT METHOD IN TEACHING ECOLOGY. Plant World 21: 267-283, 



illus. 1918. 

 Hanson, H. C, and Aikman, J. M. (2438) 



TRANSECT METHOD OF STUDYING WOODLAND VEGETATION ALONG STREAMS. 



Bot. Gaz. 80: 168-187, illus. 1925. 

 and Noll, W. (2439) 



MEASUREMENT OF RUN-OFF AND SOIL EROSION BY A SINGLE INVESTIGATOR. 



Ecology 16: 1-12, illus. 1935. 

 West, F. L., Eddlefsen, N. E., and Ewing, S. (2440) 



DETERMINATION OF NORMAL TEMPERATURES BY MEANS OF THE EQUATION 

 OF THE SEASONAL TEMPERATURES VARIATION AND A MODIFIED THERMOGRAPH 



record. Jour. Agr. Research 18: 499-510, illus. 1920. 

 West, Oliver. • (2440a) 



AN INVESTIGATION OF THE METHODS OF BOTANICAL ANALYSIS OF PASTURE. 



So. African Jour. Sci. 33: 501-559. 1937. 



Wherry, E. T. (2441) 



AN IMPROVED FIELD METHOD FOR MEASURING ACIDITY AND ALKALINITY. 



Ecology 5: 111. 1924. 

 Whitfield, C. J. (2442) 



A METHOD FOR THE REMOVAL OF PLANTS AND SOILS IN AN UNDISTURBED 



condition. Jour. Forestry 31: 424-426, illus. 1933. 

 Willard, C. J., and McClure, G. M. (2443) 



THE QUANTITATIVE DEVELOPMENT OF TOPS AND ROOTS IN BLUEGRASS WITH AN 



improved method of obtaining root yields. Jour. Amer. Soc. Agron. 

 24: 509-514. 1932. 



