174 Report OF THE BOTANICAL DEPARTMENT OF THE 
At digging time four rows in the middle of the sprayed strip 
were weighed as were also four unsprayed rows on each side. 
The yields were as follows: 
Four sprayed rows, 2,546 pounds or at the rate of 277 bushels 
29 pounds per acre. 
Four unsprayed rows on the south, 2,010 pounds. 
Four unsprayed rows on the north, 1,830 pounds. 
Average yield of the unsprayed rows, 208 bushels per acre. 
Gain due to spraying, 6914 bushels of marketable tubers per 
. 
acre. 
Most of the gain was due to the prevention of rot. On the 
unsprayed rows more than one-fourth of all the tubers were rot- 
ten, while on the sprayed rows there were but few rotten tubers. 
This experiment differs from most of the others in that only a 
narrow strip was sprayed while the remainder of the field, about 
five acres, was left unsprayed. 
The market price of potatoes at digging time was 50 cents 
per bushel. 
EXPERIMENT No. 40. 
Conducted by W. A. Fleet, Cutchogue, Long Island. One field 
of about nine acres and another of a little less than one acre 
were sprayed four times, commencing July 19 and repeating at 
intervals of eight days. The sprayer used was a New Hudson 
which sprays four rows at a time with two nozzles per row. 
The expense of spraying was about 64 cents per.acre for each 
application. 
In the nine-acre field there were no unsprayed rows, but in 
the smaller field, which was of the variety Rural New Yorker 
No. 2, one row 27 rods long was left unsprayed. We saw this 
experiment on August 9 at which time both the sprayed and 
unsprayed rows were quite badly attacked by late blight, but the 
unsprayed row was much the worse. Mr. Fleet informs us that 
the unsprayed row died two weeks earlier than the sprayed. 
The unsprayed row yielded 355 pounds or at the rate of 192 
bushels 49 pounds per acre, while an adjacent sprayed row yielded 
470 pounds or at the rate of 255 bushels 17 pounds per acre, mak- 
ing the gain due to spraying 62 bushels 28 pounds per acre. The 
greater yield on the sprayed rows was mainly due to the increased 
