No. 4.] 



PLANT DISEASES. 



35 



Gains from the Use of Bordeaux Mixture on Late Potatoes at the Ver- 

 mont Experiment Station. (Bushels of Tubers per Acre.) 



I trust that what has been said has sufficed at least to make 

 clear the fundamental propositions outlined at the beginning ; 

 namely, that the understanding of plant diseases from the 

 practical standpoint and the intelligent application of reme- 

 dial measures is conditioned upon a study of each crop by 

 itself, — as to the correlation of its diseases with each other, 

 and especially as to their relation to the history of the crop 

 under human cultivation and to the development of the plant 

 as an individual. 



If so, I wish now in closing to go one step farther, — 

 along the same line, it is true, but a step in advance. So 

 fer we have spoken of the things of which we are certain 

 from past experience, but this last is a matter rather of hope 

 than of assurance. When speaking of the diseases of the 

 apple, it was noted that there is a remarkable difference in 

 the susceptibility to disease of various varieties. Moreover, 

 it is a matter of common knowledge that this is (piite gener- 



