124 



Purer, E. A. (2261) 



FOLIAR DIFFERENCES IN EIGHT DUNE AND CHAPARRAL SPECIES. Ecology 15: 



197-203, illus. 1934. 

 Runton, EH. (2262) 



THE ORGANIZATION OF THE CREOSOTE BUSH WfTH RESPECT TO DROUGHT. 



Ecology 15: 128-138, illus. 1934. 

 Shantz, H. L. (2263) 



DROUGHT RESISTANCE AND SOIL MOISTURE. Ecology 8: 145-157. 1927. 



Shirley, H. L. (2264) 



does light burning stimulate aspen suckers? Jour. Forestry 30: 

 419-420. 1932. 



Spalding, V. M. (2265) 



BIOLOGICAL RELATIONS OF CERTAIN DESERT SHRUBS. I. THE CREOSOTE BUSH 

 (COVILLEA TRIDENTATA) IN ITS RELATION TO WATER SUPPLY. Bot. Gaz. 38: 



122-138, illus. 1904. 



Weaver, J. E. (2266) 



the ecological relations of roots. 128 pp., illus. 1919. (Carnegie 

 Inst. Wash. Pub. 286.) 



(2267) 



ROOT DEVELOPMENT IN THE GRASSLAND FORMATION, A CORRELATION OF THE 

 ROOT SYSTEMS OF NATIVE VEGETATIONS AND CROP PLANTS. 151 pp., illus. 



1920. (Carnegie Inst. Wash. Pub. 292.) 

 ■ (2268) 



INVESTIGATIONS ON THE ROOT HABITS OF PLANTS. Amer. Jour. Bot. 12: 



502-509- illus. 1925. 



(2269) 



UNDERGROUND PLANT DEVELOPMENT IN ITS RELATION TO GRAZING. Ecology 



11: 543-557, illus. 1930. 

 and Kramer, J. (2270) 



ROOT SYSTEM OF QUERCUS MACROCARPA IN RELATION TO THE INVASION OF 



prairie. Bot. Gaz. 94: 51-85, illus. 1932. 

 Wherry, E. T. (2271) 



DIVERGENT SOIL REACTION PREFERENCES OF RELATED PLANTS. EcologV 8: 



197-206. 1927. 



See also CaldweU (2475), Cockerell (2621), Darwin (3927), Garner and 

 others (2502), Hanson (2511), Hedgcock (2523), Lamb (1644), Livingston 

 (1554), Lister and others (1648a), and Weaver (2597). 



METHODS OF STUDY 



Publications treating of the methods of study, descriptions of instruments, 

 sample areas of vegetation, and other material related thereto, used by the 

 investigator in range plant ecology, including methods of soil analysis. See also 

 section on Range Research for closely related references. 



Abbe, C. (2272) 



rain gage and the wind. U. S. Monthly Weather Rev. 27: 464-468, illus. 

 1899. 



Allen, W. E. (2273) 



THE PROBLEM OF SIGNIFICANT VARIABLES IN NATURAL ENVIRONMENTS. 



Ecology 10: 223-227. 1929. 

 Alway, F. J., Kline, M. A., and McDole, G. R. (2274) 



SOME NOTES ON THE DIRECT DETERMINATION OF THE HYGROSCOPIC COEFFI- 

 CIENT. Jour. Agr. Research 11: 147-166. 1917. 



McDole, G. R., and Trumbul, R. S. (2275) 



RELATION OF MINIMUM MOISTURE CONTENT OF SUBSOIL OF PRAIRIES TO HYGRO- 

 SCOPIC coefficient. Bot. Gaz. 67: 185-207, illus. 1919. 



■ and Russell, J. C. (2276) 



USE OF THE MOISTURE EQUIVALENT FOR THE INDIRECT DETERMINATION OF THE 



hygroscopic coefficient. Jour. Agr. Research 6: 833-846. 1916. 



