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96. McMurran, S. M. U. S. D. A. Bui. 756. 1919. 



97. Mix, A. J. N. Y. Agr. Exp. Sta. Bui. 426. 1916. 



98. Morse, W. J. Me. Agr. Exp. Sta. Bui. 271. 1918. 



99. Nisbit, J. Studies in Forestry. P. 77. Oxford, 1894. 



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101. Palmer, A. H. U. S. D. A., Mo. Weather Rev. 48: 151-154. 1920. 



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104. Rixford, G. P. U. S. D. A. Bui. 732. 1918. 



105. Rosa, J. T. Jr. Proc. Am. See. Hort. Sci. 17: 207-210. 1920. 



106. Rotmistrov, V. G. Nature of Drought According to the Evidence of the 



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108. Schnee, F. tJber den Lebenszustand allseitig verkorkter Zellen. Dissertation. 



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109. Schwartz, F. Unters. a. d. Bot. Inst, zu Tubingen. 1:140. 1883. 



110. Shear, C. L. U. S. D. A., Farmers' Bui. 1081. 1920. 



111. Smith, J. W. U. S. D. A., Mo. Weather Rev. 48: 446. 1920. 



112. Sorauer, P. Pflanzenkrankeiten. 3te Auflage. 1:169-170. Berlin, 1909. 



113. Ibid. P. 210. 



114. Ibid. P. 275, 284-285. 



115. Ibid. P. 286. 



116. Ibid. P. 324. 



117. Ibid. P. 332. 



118. Ibid. P. 335. 



119. Ibid. P. 422. 



120. Ibid. P. 435. 



121. Spoehr, H. A. Carnegie Inst. Wash. Publ. 287. 1919 



122. Stewart, J. P. Pa. Agr. Exp. Sta. Bui. 134. 1915. 



123. Stewart, J. P. Pa. Agr. Exp. Sta. Bui. 141. 1916. 



124. Taylor, E. P., and Downing, G. J. Ida. Agr. Exp. Sta. Bui. 99. 1917. 



125. Thompson, R. C. Ark. Agr. Exp. Sta. Bui. 123. 1916. 



126. Tucker, M., and von Seelhorst, C. Journ. f. Landw. 46: 52-63. 1898. 



127. Tufts, W. P. Letter to one of the authors, dated March 21, 1921. 



128. U. S. D. A., Div. Agr. Soils Buls. 1, 2 and 3. 1895. 



129. Van Slyke, L. L., Taylor, O. M., and Andrews, W. H. Geneva Agr. Exp. Sta. 



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130. Von Seelhorst, C. Journ. f. Landw. 58: 83-88. 1910. 



131. Weaver, J. E. Cam. Inst. Wash. Publ. 286. 1919. 



132. White, J. Proc. Roy. Soc. Victoria. 24 (N. S.): 2-16. 1911. 



133. Whitehouse, W. E. Ore. Agr. Exp. Sta. Bui. 134. 1916. 



134. Whitten, J. C. Mo. Agr. Exp. Sta. Bui. 49. 1900. 



135. Whitten, J. C. Mo. Agr. Exp. Sta. Research Bui. 33. 1919. 



136. Widtsoe, J. A. Dry Farming. P. 185. New York, 1911. 



137. Wiggins, P. G. Am. Jour. Bot. 8: 30-40. 1921. 



138. Woodbury, C. G., Noyes, H. A., and Oskamp, J. Purdue Univ. Agr. Exp. 



Sta. Bui. 205. 1917. 



139. Zon, R. Proc. Soc. Amer. Foresters. 2: 79. 1907. 



