LIST OF ILLUSTRATIONS 



FIG. 



1. GREVILLEA FROM KEW GARDENS - - Frontispiece 



2. EFFECT OF HUMOGEN ON LILIES - - FACING PAGE g 



3. BACILLUS RADICICOLA - - - 53 



4. AZOTOBACTER CHROOCOCCUM - - 53 



5. PRIMULA TREATED WITH AUXIMONES - -58 



6. HUMOGEN CONTRASTED WITH LOAM AND COMPOST 60 



7. HYACINTHS TREATED AND UNTREATED - "91 



8. AN INSTANCE OF INCREASED VARIEGATION - 143 



9. A TOMATO PLANT - - - - -145 



10. POTATOES GROWN IN MOSS - - - 146 



11. ROOT DEVELOPMENT - - - - 159 



12. INFLUENCE OF HUMOGEN ON BARLEY - - 165 



13. CARNATIONS IN INFECTED SOIL - - 1 66 



14. TWO BEAN PLANTS - - - - 183 



15. MAIZE PLANTS, SHOWING EFFECT OF AUXIMONES - 191 



1 6. A CONTRAST IN RADISHES ... T g^ 



17. PRIMULA KEWENSIS - - - - 212 



