XIV CONTENTS. 



CHAPTER IV. 



PAGE 



10. NATUEAL AND ARTIFICIAL INFECTION, 50 



CHAPTER V. 

 § 11. DISPOSITION OF PLANTS TO DISEASE, 58 



CHAPTER VI. 



§ 12. PREVENTIVE AND COMBATIVE MEASURES, - 63 



I. Extermination and Removal op the Parasitic 



Fungi alone, 65 



II. Removal and Destruction of Diseased Plants, 71 



III. Avoidance or Removal of Conditions which Favour 



Infection, 75 



IV. Selection of Hardt Varieties, 81 



CHAPTER VII. 

 § 13. ECONOMIC IMPORTANCE OF DISEASES OF PLANTS, 83 



CHAPTER VIII. 



SYMBIOSIS: MUTUALISM, 86 



CHAPTER IX. 



SYMBIOSIS: NUTRICISM, 92 



EcTOTROPHio Mtcorhiza, 93 



Endotrophic Mycorhiza, - 97 



Mtcodomatia of the Alder, etc., 99 



MrCODOMATIA of THE LEQUMINOSAE, 101 



