THE KUHNIAN PERIOD 53 



Second Part 



Special investigations on diseases of cultivated plants. 

 The smuts of cereals. 

 The rust. 

 The ergot. 



The mildew, sooty mold, and honey dew. 

 The leaf blight or leaf spot disease. 

 The disease of rape and rape seed. 

 The seed rot of Fullers' teasel and the gout or cockle 



disease of wheat. 

 The diseases of tuber and root crops. 



Appendix 

 The microscope as a household utensil for the farmer. 



In the case of those diseases especially investigated (as 

 above indicated) methods of control based on a proper 

 conception of the causal factors involved and thoroughly 

 tested in actual practice by the author are recorded. 

 This book is a model of conciseness and accuracy that has 

 not been excelled by any of the numerous pathologists 

 who have written books since that time. This is the 

 great achievement of the father of modern plant pathol- 

 ogy that he was the first to apply the scientific knowledge 

 of his |day to the practical solution of plant disease 

 problems, and so fundamental has been this contribution 

 of Kiihn's that it has remained to the present time the 

 vitalizing factor in the wonderful growth and develop- 

 ment of the science. 



In 1868 appeared the text-book "Phytopathologie,"i 



'Hallier, E.: Phytopathologie. Die Krankheiten der Culturge- 

 wachse fiir Land- und Forstwirthe, Gartner und Botaniker, pp. I-X -H 

 1-37.3, 1868. 



