370 SOIL CONDITIONS AND PLANT GROWTH 



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 reference 

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132. Hendrick, J., and Ogg, W. G., "Studies of a Scottish Drift Soil : I. 



The Composition of the Soil and of the Mineral Particles which 

 Compose it," Journ. Agric. Set., 1916, vii., 458-69; 1920, x., 333- 

 57 100, 118, 334 



133. Hilgard, E. W., (a) Soils : Their Formation, Properties, Composition 



and Relations to Climate and Plant Growth in the Humid and Arid 

 Regions, New York, 1906 ....... 143, 152, 223 



{b) " Die Boden arider und humider Lander," Internat. Mitt. Boden- 

 kunde, 1911, i., 415-29 139 



134. Hills, T. L., " Influence of Nitrates on Nitrogen Assimilating Bac- 



teria," jfourn. Agric. Research, 1918, xii., 183-230 .... 199 



135. Hiltner, L., (a) " Ueber die Ursachen welche die Grosse, Zahl, Stel- 



lung und Wirkung der Wurzelknollchen der Leguminosen bedingen," 

 Arb. Biol. Abt.fiir Land. u. Forstwirtschaft am d. Kais. Gesundh. 

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(6) Hiltner, L., and Stormer, K., " Neue Untersuchungen iiber die 

 Wurzel Knollchen der Leguminosen und derenErreger,"t6frf., 1903, 

 iii 205, 208 



(c) " Studien iiber die Bakterienflora des Ackerbodens, mit besonderer 

 Berucksichtigung ihres Verhaltens nach einer Behandlung mit 

 Schwefelkohlenstoff und nach Brache," ibid., 1903, iii.. Heft 5 276, 281 



{d) Hiltner, L., " Ueber neue Ergebnisse und Probleme auf dem 

 Gebiete der landwirtschaftlichen Bakteriologie," jfahresber. Verein, 

 fur Angew. Bot., 1907, 200 ........ 281 



136. Hissink, D. J., " Ueber die Bedeutung und die Methode der chemischen 



Bodenanalyse mit starker heisser Salzsaure," Internat. Mitt. Boden- 

 kunde, 1915, v., r-24. ......... 344 



136a. Hoagland, D. R., " The Effect of Hydrogen- and Hydroxyl-ion 

 Concentration on the Growth of Barley Seedlings," Soil Sci., 1917, 

 iii-. 547-59 81 



{b) Hoagland, D. R., and Sharp, L. T., " The Freezing- Point Method 

 as an Index of Variations in the Soil Solution Due to Season and 

 Crop Growth," Journ. Agric. Research, 1918, xii., 369-95 . 125, 127 



(c) " Relation of the Concentration and Reactions of the Nutrient 

 Medium to the Growth and Absorption of the Plant," Journ. Agric. 

 Research, 1919, xviii., 73-117. (Also Science, 1920, Iii., 562) . 80, 238 



137. Home, Francis, The Principles of Agriculture and Vegetation, 1756 . 6 



138. Hopkins, C. G., Soil Fertility and Permanent Agriculture, 1910, Bos- 



ton 321 



139. Howard, A., and Howard, G. L. C, Bull. 61, Ag. Res. Inst., Pusa, 



1916. 

 Annual Rept. Imp. Econ. Bot., 1916-17. Summaries of Mr. and Mrs. 

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 Agric. Journ., India, 1917 (Congress Number) .... 52 



140. Hutchinson, H. B., and Miller, N. H. J., (a) "Direct Assimilation of 



x\mmonium Salts by Plants," Journ. Agric. Sci., 1909, iii., 179-94 • 5^ 



(b) " The Direct Assimilation of Inorganic and Organic Forms of 

 Nitrogen by Higher Plants," ibid., 1912, iv., 282-302 ... 59 



(c) Hutchinson, H. B., and McLennan, K., " The Relative Effect of 

 Lime as Oxide and Carbonate on Certain Soils," ibid., 1914, vi., 

 302-22 295 



