XIV CONTENTS. 



CHAPTER IV. 



PAGE 



§ 10. NATUEAL AND ARTIFICIAL INFECTION, - - 50 



CHAPTER V. 



§11. DISPOSITION OF PLANTS TO DISEASE, - - 68 



CHAPTER VL 



§ 12. PREVENTIVE AND COMBATIVE MEASURES, - - 63 



I. Extermination and Removal of 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 Hardy Varieties, - - - 81 



CHAPTER Vn. 



§ 13. ECONOMIC IMPORTANCE OF DISEASES OF PLANTS, 83 



CHAPTER Vni. 



SYMBIOSIS: MUTUALISM, 86 



CHAPTER IX. 



SYMBIOSIS: NUTRICTSM, 92 



Ectotrophic Mycorhiza, - - - - - 93 



Endotrophic Mycorhiza, - - - - - 97 



Mycodomatia of the Alder, etc., - - - - 99 



Mycodomatia of the Leouminosae, - - - - 101 



