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Page of text 

 on which 

 reference 

 is made. 



121. Hall, A. D., and Russell, E. |., (o) Agriculture and Soils of Kent, 



Surrey, and Sussex, 1911 (Board of Agriculture) . . 327 et seq. 



(b) "Soil Surveys and Soil Analysis," Joiirn. Agric. Sci., 1911, iv., 



181-223 • 327 ei s^l. 



' - (r) " On the Causes of the High Nutritive Value and Fertility of the 



Fatting Pastures of Romney Marsh," ibid., igi2, iv., 339-70 . . 317 

 {d) Hall, A. D., Brenchley, W. E., and Underwood, L. M., " The Soil 



Solution and the Mineral Constituents of the Soil," Phil. Trans., 



1913, cciv,, 179-200 51. 52, 173, 238 



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



Determine the Stability of Irreversible Hydrosols,'" Proc. Roy. Soc, 

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 •38-43) 161 



123. Harris, F. S., and Butt, N. I., " Effect of Irrigation Water and 



Manure on the Nitrates and Total Soluble Salts of the Soil," jfourn. 

 Agric. Research, 1917, viii., 333-60 49 



124. Harris, J. E., "Soil Acidity," Mich. Tech. Bull. 19, 1914 . . . iii 



125. Harrison, F. C, and Barlow, B., " The Nodule Organism of the 



Leguminosae : its Isolation, Cultivation, Identification and Com- 

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126. Harrison, W. H., and Aiyer, S., " Gases of Swamp Rice Soils," Pusa 



Mem. Cheju. Series, 1913, iii., 65-106, and 1914, iv., 1-17 . 213, 256 



127. Hart, E. B,, and Peterson, W. H., " Sulphur Requirements of Farm 



Crops in Relation to the Soil and Air Supply," Wisconsin Agric. 

 Expt. Sta. Research Bull. No. 14, 191 1 76 



128. (a) Hartwell, B. L., and Pember, F. R., "Aluminium as a Factor In- 



fluencing the Effect of Acid Soils on Different Crops," jfourn. Amer. 

 Soc. Agron., 1918, x., 45 112 



(b) Hartwell, B. L., and Damon, S. C, " The Comparative Effect on 

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129. Heinrich, R., " Ueber das Vermogen der Pflanzen, den Boden an 



Wasser zu erschopfen," yahresber. Agrik. Chem., 1875-76, xviii. and 

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130. Hellriegel, H,, (a) Beitrdge zu den naturwissenschafilichen Grttnd- 



lagen des Ackerbaues Braunschweig, 1883 ..... 43 



{b) " Die Methode der Sandkulturen," Arb. Dent, landw. Gesell., Heft 

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(c) Hellriegel, H., and Wilfarth, H., " Untersuchungen iiber die Stick- 

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f. d. Rilbenzucker-Industrie, 1888 24, 59 



{d) Hellriegel, H., Wilfarth, H., Romer and Wimmer, " Vegetations- 

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13T. Helmont, Johan Baptista van (1577-1644), Opera omnia Complexionum 



atque mistionum elementalium figmentum 2 



24 



