A SELECTED BIBLIOGRAPHY 159 



Page of text 

 ou which 

 reference 

 is made. 



125. Hardy, W. B., "A Preliminary Investigation of the Conditions which Determine 



the Stability of Irreversible Hydrosols," Proc. hoy. Soc, iSgg, Ixvi., 110-25, 

 (See also " Electrolytes and Colloids, The Physical State of Gluten," Wood 

 and Hardy, ibid., igog, Ixxxi., 38-43) 59 



126. Harrison, F. C, and Barlow, B., " The Nodule Organism of the Lsguminosas : 



its Isolation, Cultivation, Identification and Commercial Application," Centr. 

 Bakt. Par., Abt. II., igoy, xix., 264-72, 426-41 96, 98 



127. Heinrich, R., " Ueber das Vermogen der Pflanzen, den Boden an Wasser zu 



erschopfen," yahresber. Agrik. Chem., 1875-76, xviii. and xix.. Part I., 368-72 104 



128. Hellriegel, H., Beitrage zu den naturwissenschqftlichen Grundlagen des Acker- 



baues, Braunschweig, 1883 27, 28 



129. Hellriegel, H., "Die Methode der Sandkulturen," Arb. Deut. landw. Gesell., 



Heft 34, i8g8 — 



130. Hellriegel, H., and Wilfarth, H., " Untersuchungen iiber die Stickstoffnahrung 



der Gramineen und Leguminosen," Zeitsch. des Vereins f, d. Rubenzucker- 

 Indusirie, 1888 16, 31 



131. Hellriegel, H., Wilfarth, H., Romer and Wimmer, " Vegetationsversuche iiber 



den Kalibedarf einiger Pflanzen," Arb. Deut. landw. Gesell., i8g8, 34 37, 40, 41, 43 



132. Helmont, Johan Baptista van (1577-1644), Opera omnia Complexionum atque 



mistionutn elementalium figmentum 2 



133. Hilgard, E. W., Soils : Their Formation, Properties, Composition and Relations 



to Climate and Plant Growth in the Humid and Arid Regions, New York, 

 1906 71, 72 



134. Hiltner, L., "Ueber die Ursachen welche die Grosse, Zahl, Stellung und 



Wirkung der WurzelknoIIchen der Leguminosen bedingen," Arb. Biol. Abt. 

 fur Land. u. Forstwirtschaft am d. Kais. Gesundh, Amt., igoo, i., 177-222 . g6 



135. Hiltner, L., and Stormer, K., "Neue Untersuchungen iiber die Wurzel KnoU- 



chen der Leguminosen und deren Erreger," Arb. Biol. Abt. d. Kais. Gesundh. . 

 Amt., igo3, iii 96, 98 



136. Hiltner, L., and Stormer, K., " Studien iiber die Bakterienflora des Ackerbodens, 



mit besonderer Berucksichtigung ihres Verhaltens nach einer Behandlung mit 

 Schwefelkohlenstoif und nach Brache," Arb. Biol. Abt. fur Land. u. Forst- 

 wirtschaft am d. Kais. Gesundh. Amt., igo3, iii.. Heft $ 114 



137. Hiltner, L., " Ueber neue Ergebnisse und Probleme auf dem Gebiete der 



landwirtschaftlichen Bakteriologie," jfahresber. Verein. fur Angew. Bot., 



1907, 200 115 



138. Home, Francis, The Principles of Agriculture and Vegetation, 1756 ... 4 

 I3g. Hopkins, C. G., Soil Fertility and Permanent Agriculture, igio, Boston . . 131 



140. Hutchinson, H. B., and Miller, N. H. J., " Direct Assimilation of Ammonium 



Salts by Plants," yoMJ-M. /4^nc. S«., igog, iii., 179-94 30 



141. Hutchinson, H. B., and Miller, N. H. J., " The Direct Assimilation of Inorganic 



and Organic Forms of Nitrogen by Higher Plants," Centr. Bakt. Par., Abt. 



II., 1911, XXX., 513-47 3 J 



142. Ingen-Housz, Jan, Experiments upon Vegetables, Discovering Their Great Power 



cf Purifying Common Air in the Sunshine, and of Injuring in the Shade and 



at Night, London, 1779 g 



143. Ingen-Housz, Jan, "Essay on the Food of Plants and the Renovation of 



Soils," Brf. q/'^gric. i?/<i., London, 1796 



144. King, F. H., Annual Reports of the Wisconsin Experiment Station, 6th Rpt., 



1889, and onwards 



145. King, F. H., The Soil, iSgg (Macmillan) 



146. KiiDgfF.H., Physics of Agriculture, MsLdisonjXJ.S. A 



147. Kearney, Thomas H., and Cameron, Frank K., " Some Mutual Relations 



^ between Alkali Soils and Vegetation," U.S. Dept. of Agric. Rpt., 71, igo2 . 43 



148. Kearney, Thomas H., and Harter, L. L., "The Comparative Tolerance of 



Various Plants for the Salts Common in Alkali Soils," Bull. 113, Bur. of Plant 

 Industry, U.S. Dept. of Agric, igo7 ., 



