RESEARCH METHODS IX STUDY OF FOREST ENVIRONMENT. 207 



132. McLaughlin, W. W. Capillary movement of soil moisture. U. S. Dept. Agr 



Bull. 835, 1920. Contribution from Bur. Public Roads. 



133. Moore, Barrington. Osmotic pressure as an index of habitat. Jour. Forestry 



XV, 8, Dec. 1917. 



134. Nernst, W. Theoretical chemistry. 7th German edition. London, 1916. 



135. Osborn, H. F. The origin and evolution of life. New York, 1918. 



136. Patten, II. E., and Gallagher, F. E. Absorption of vapors and gases by soils. 



U. S. Dept. Agr., Bur. of Soils, Bull. 51, 1908. 



137. Schull, H. A. Measurement of the surface forces in soils. Bot. Gaz., vol 



pp. 1-31. 1916. 



138. Schreiner. ()., and Skinner, J. J. Nitrogenous soil constituents and their 



bearing on soil fertility. U. S. Dept. Agr., Bur. Soils, Bull. 87, 1912. 



139. Shreve, Forrest. Rainfall as a determinant of soil moisture. Plant World, 



vol. 17. Xo. 1, 1914. 



140. Soils, Bureau of. Soil survey field book. U. S. Dept. Agr., 1906. 



141. Whereby, E. T. Soil acidity and a field method for its measurement. Ecology. 



I, 3. L920. 



142. Whitney, M. I). Methods of the mechanical analysis of soils and of the de- 



termination of the amount of moisture in soils in the field. U. S. Dept. 

 A.gr., Bur. of Soils, Bull. 4, 1896. 



WIND MOVEMENT. 



145. Bates, <'. <i. The role of light in natural and artificial reforestation. Jour. 



Forestry. XV, 2, 1917. 



146. Humphreys, W. J. Wind velocity and elevation. U. S. Weather Bur., Mo. 



Weather Rev.. XLIV, I, p. 14-17, Jan., 1916. 



147. Marvin, C. F. Anemometer tests. U. S. Weather Bur., Mo. Weather Rev.. 



XXVI II. 2. p. 58 63, Feb., 1900. 



148. Sandstrom, J. W. Working up wind observations. l T . S. Weather Bur., Mo 



Weather Rev., XLIII. II. p. 547-556, Nov., 1915. 



149. U. S. Weather Bureau. Instru< tions for the installation and maintenance 



of wind measuring and recording apparatus. (Circ. D, Instrument Div. 

 U. S. Dept. Agr., Weather Bull. 530, 1914. 



150. Weidman, IF II. The windfall problem in the Klamath region, Oregon. Jour. 



Forestry. XVIII. S, 1920. 



EVAPORATION. 



151. Bates, < ' . G. A new evaporimeter for use in forest studies. U. S. Weather Bur., 



Mo. Weather Rev.. May, 1919. 



152. Bigelow, F. H. A manual for observers in climatology and evaporation. IJ. S. 



Dept. Agr., Weather Bull. Xo. 409, 106 p., 1909. 



153. Briggs, L. J., and Shantz. H. L. The water requirements of plants. U. S. 



Dept. Agr.. Bur. Plant Ind., Bulls. 284 and 285. 

 154 - • - -• Relative water requirements of plants. U. S. Dept. Agr., 



Jour. Agr. Res., Ill, 1, 1914. 



155. Kadel, B. C. Instructions for installation and operation of Class A evaporation 



stations. U. S. Weather Bur. (Instrument Div., Circ. L.), 1915. 



156. Kiesselbach, T. A. Transpiration as a factor in crop production. Xebr., Agr. 



Exp. Station Bull. 6, 1916. 



157. Kimball, H. II. Evaporation observations in United States. U. S. Weather 



Bur., Mo. Weather Rev., XXXII, 12, p. 559, Dec, 1904. 

 lo8. Livingston, B. E. A rain correcting atmometer for ecological instrumentation. 

 Plant World, 13, p. 78-83, 1910. 



