PLATES 



PAGE 



I Pouring Slag from Basic Open Hearth Furnace . . . 113 



Shipping Phosphate from Nauru Island ... . . 113 



II Ocean Island Phosphate Workings . . *, . . . 114 



III Experimental Plots at Martin's Hearne, June 1918 . . 115 



IV Experimental Plots at Martin's Hearne, June 1918 . . 116 

 V Section of the Soil at Hassobury 117 



VI Experimental Plots at Horndon, July 1920 . . . . 118 



VII Samples of Vegetation at Horndon, Aug. 1919 . . . 119 



VIII Samples of Vegetation at Horndon, Aug. 1919 . . '. v 120 



Photograph of Chalk Pit at Saffron Walden .... 120 



MAP 



Experimental Stations in Essex . . . . . . . xvi 



