LIST OF PLATES. 



Portrait of J. B. J. Dieudonn£ Boussingault (1802- 



1887) f - - - - - - Frontispiece 



TO FACE PAGE 



Fig. 9. — Influence of medium on root development of 



LUPINES 53 



Fig. II. — Swedes from Agdell field, Broadbalk : un- 

 manured; superphosphates and potassic fertilisers; 

 and complete fertiliser 65 



Fig. 30A. — Poor grass pasture, untreated plot, 

 Horndon-on-the-hill, Essex (London clay) - 



Fig. 30B. — Adjoining plot, but treated with 

 Gafsa phosphate, Feb. 27TH, 1918 



between 

 312 & 313 



