CONTENTS XI 



Page 



CHAPTER XXIV. — Plants as Disease Producers, Epiphytotism, Prophy- 

 laxis .... . . . ... 2g8 



Vegetal Agents of Disease; Parasitic Flowering Plants; Fungous Organisms 

 as the Cause of Disease; Mechanic Injuries; Injuries Due to Meteorologic 

 Causes; Infection; Incubation; Duration of Disease; Dissemination of 

 Fungi; Epiphytotisms (Epidemics); Prophylaxis. 



CHAPTER XXV.— Practical Tree Surgery . . .... 319 



Preventive Measures; Character of Work; Cavity Treatment; Mixing and 

 Placing the Cement; Metal-covered Cavities; Guying. 



CHAPTER XXVI.— Internal Causes of Disease .^26 



Enzymes; Panaschiering; Calico; Nutritive Disturbances; Mutations; Mal- 

 formations and Monstrosities; Graft Hybrids; Chimasriis. 



CHAPTER XXVII. — Classification of Abnormalities. . . . 331 



CHAPTER XXVIII. — Symptoms of Disease (Symptomatology). 341 



Symptoms of Disease; Discolorations; Shot-holes; Wilting; Necrosis, 

 Dwarfing; Hypertrophy; Replacement; Mummification; Alteration of 

 Position; Destruction of Organs; Excrescences and Malformations; 

 Exudations; Rotting; Bibliography of Diseases in General. 



CHAPTER XXIX.— Pathologic Plant Anatomy . . . -354 



Restitution; Hypoplasia; Metaplasia. 



CHAPTER XXX. — Pathologic Plant Anatomy (Continued). 364 



Hypertrophy; Excrescences; Intumescences; Callous Hypertrophy; Ty- 

 loses; Gall Hypertrophies; Hyperplasia; Homooplasia; Heteroplasia; 

 Callus; Conditions of Callous Formation; Wound Wood; Wound Cork. 



CHAPTER XXI.— Galls . . . . 3«4 



Kinds of Galls; Cataplasms; Histology of Cataplasms; Histology of Galls, 

 Cecidial Tissue Forms; Bibliography of Galls. 



CHAPTER XXXII. — Mechanic Development of Pathologic Tissues . . 403 

 General Consideration; Bibliography of Developmental Mechanice, Sug- 

 gestions to Teachers and Students. 



PART III. SPECIAL PLANT PATHOLOGY 



CHAPTER XXXIII.— Specific Diseases of Plants. . . ..411 



General Statement; Principal Publications; List of Common and Important 

 Diseases of Economic Plants in the United States and Canada Arranged 

 according to Host Plants. 



CHAPTER XXXTV. — Detailed Account of Specific Diseases of Plants . 47s 

 Alfalfa to Grape. 



CHAPTER XXXV. — Detailed Account of Specific Plant Diseases 



(Continued) . • • 5^7 



Hemlock to Wheat. 



