1907.] DISCUSSION. 223 



York state they have figured it down, and they have gotten a 

 less cost. I think it runs there from three to six dollars. 



Question. Have you sprayed some vines on your own 

 fields and left others unsprayed for purposes of comparison? 



Prof. Clinton. Oh yes, and then we have compared the 

 yield of the two to test them. That is the only way to do. 

 Some people may spray a whole field and possibly not do any 

 good, but if they got a good yield they would say that that was 

 good spraying when, of course, it would mean practically 

 nothing. 



Question. What is the average yield one year with 

 another comparing the sprayed potatoes with the unsprayed? 



Prof. Clinton. That varies greatly with the years. You 

 get a per cent, which is scarcely noticeable some years, and in 

 others you would get a good per cent. I have gotten as high 

 as a hundred per cent. In New York their increase runs from 

 twenty-five to over a hundred per cent, in a vast number of 

 experiments which they have carried on. 



Question. What do you think of drill culture? Do you 

 plant in drills or in rows ? 



Prof. Clinton. Just in rows. 



The President. Do you think you get as big a yield in 

 drill culture ? 



Prof. Clinton. I do not pretend to speak along that line 

 at all because my subject is fungus diseases. I am not here 

 to tell you farmers how to grow potatoes. That is not my 

 specialty. 



The President. As I understand, in carrying on those 

 spraying operations, you went across one way and then back 

 the other? 



Prof. Clinton. No, not quite that. I went back on the 

 same rows only in the opposite direction. In using one of these 

 power sprayers you cannot throw it, by going through in one 

 direction, so as to get it all over the plant, but by reversing 



