1 8o SOIL CONDITIONS AND PLANT GROWTH 



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 on which 

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 is made. 



114. Gully, E., " Ueber die Beziehungen zwischen Vegetation, chemische Zusam- 



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115. Guthrie, F. B., and Helms, R., "Pot Experiments to Determine the Limits of 



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116. Hales, Stephen, Statical Essays, Containing I. Vegetable Staticks, etc.; II. 



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117. Hall, A. D., and Flymen, F. J., " The Determination of Available Plant Food 



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118. Hall, A. D., and Miller, N. H. J., "The Effects of Plant Growth and of 



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119. Hall, A. D., and Morison, C. G. T., " On the Function of Silica in the Nutrition 



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120. Hall, A. D., and Morison, C. G. T., " The Floculation of Turbid Liquids by 



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121. Hall, A. D., and Gimingham, C. T., " The Interaction of Ammonium Salts and 



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122. Hall, A. D., " On the Accumulation of Fertility by Land Allowed to Run Wild," 



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123. (a) Hall, A. D., and Russell, E. J., Agriculture and Soils of Kent, Surrey, and 



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(c) Hall, A. D., Brenchley, W. E., and Underwood, L. M., " The Soil Solution 



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124. Hart, E. B., and Peterson, W. H., "Sulphur Requirements of Farm Crops in 



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



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



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



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



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



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



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



mistiomtm elementaliumjigmentum ..... 2 

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

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



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135. Hiltner, L., and Stormer, K., " Neue Untersuchungen uber die Wurzel Knoll- 



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 Ami., 1903, iii 98, ioo 



