CONTENTS 



PAGE 



INTRODUCTION 11 



THE ANCIENT ERA (from Earliest Times to End of 5th Century 

 A.D.): 



Hebraic Period (to about 500 B. C.) 14 



Theophrastian Period (500 to 320 B. C.) 14 



Plinian Period (320 B. C. to 476 A. D.) 17 



Summary 18 



THE DARK ERA (6th to 16th Centuries Inclusive) 20 



THE PREMODERN ERA (1600 to about 1850) 22 



The Renaissance Period (17th Century) 22 



Summary 24 



The Zallingerian Period (18th Century) 25 



Characteristic Features 32 



The Ungerian Period (1807 to 1853) 33 



Characteristic Features 40 



THE MODERN ERA (1853 to about 1906) 41 



The Kuhnian Period (1853 to 1883) 44 



Summary 57 



The Millardetian Period (1883 to about 1906) 58 



Discovery of Bordeaux Mixture 58, 63 



Rise and Development of Plant Pathology in America .... 59 

 Discovery of Bacterial Etiology of Certain Plant Diseases . . 61 

 Discovery and Establishment of Causal Relation of Bac- 

 teria to Plant Diseases 66 



Pathogenetists and Predispositionists 71 



THE PRESENT ERA (1906 ) 108 



Establishment of Chairs of Plant Pathology in Universities and 



Colleges of Agriculture 109 



Discovery of the Cause and Nature of Crown Gall 109 



Establishment of the American Phytopathological Society. ... 110 



The United States Quarantine Act of 1912 Ill 



The Introduction of Sulfur as a Substitute for Copper in Fun- 

 gicides 112 



Development of Disease-resistant Crops 113 



The Epiphytotic of Chestnut Blight 114 



BIBLIOGRAPHY 116 



INDEX 127 



9 



