LIST OF ILLUSTRATIONS 



FIG. PAGE 



1. Sketch illustrating water culture methods 12 



2. Photograph. Barley grown with copper sulphate . . . To face 20 



3. Curve. Ditto ' . 21 



4. Photograph. Peas grown with copper sulphate . . . . To face 29 



5. Curve. Ditto 29 



6. Curve. Barley grown with zinc sulphate ...... 40 



7. Photograph. Peas grown with zinc sulphate . . . . To face 40 



8. Curve. Ditto 41 



9. Photograph. Barley grown with arsenious acid . . . .To face 54 



10. Curve. Ditto 55 



11. Curve. Peas grown with arsenious acid 55 



12. Curve. Barley grown with arsenic acid 56 



13. Curve. Barley grown with sodium arsenite 56 



14. Curve. Peas grown with sodium arsenite 57 



15. Curve. Barley grown with boric acid 69 



16. Photograph. Peas grown with boric acid To face 69 



17. Curve. Barley grown with manganese sulphate 85 



18. Photograph. Ditto To face 86 



19. Photograph. Peas grown with manganese sulphate 86 



