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Page of text 

 on which 

 reference 

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(c) " On the Causes of the High Nutritive Value and Fertility of the 

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

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



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



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



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 



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



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



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(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 



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130. Hellriegel, H., (a) Beitrage zu den naturwissenschaftlichen Grund- 



lagcn des Ackerbaues Braunschweig, 1883 43 



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

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f. d. Rilben sucker -Industrie, 1888 24, 59 



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



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2 4 



