140 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
At 45 cents per bushel, the price at digging time, 88 bushels of 
potatoes would be worth $39.60. Subtracting $7.21, the cost of 
spraying per acre, there remains a net profit of $32.59 per acre. 
SOUTHAMPTON EXPERIMENT NO. 2. 
This experiment was conducted by Lewis E. Downs who 
sprayed 31 acres of potatoes eight times. The 31 acres were all 
of the variety Carman No. 1 and in five different lots. In one 
lot, three rows 1206 feet long, three feet apart, were left un- 
sprayed. ! . ; vi ae 
The spraying was done with a “Watson” one-horse, four-row 
power sprayer like the one used in the Woodbury experiment. 
(See Plate XII, fig. 2.) As in the Woodbury experiment the 
sprayer was rigged with two nozzles per row although originally 
designed to carry but one. This change was necessitated by 
the rank growth of vines which covered the ground so com- 
pletely that it was difficult to follow the rows. Under such con- 
ditions it is impossible to cover the foliage thoroughly with one 
nozzle per row. The bordeaux mixture was hauled into the © 
field in a 450-gallon tank from which it was pumped into the 
spray tank as needed. 
The dates of spraying in the field in which the experiment rows 
were located were as follows: June 30, July 1, 5, 9, 26, August 
4,6 and 18. Paris green was applied with the bordeaux three 
times, the total quantity used being 120 pounds, which is at the 
rate of four pounds per acre. On the unsprayed rows paris 
ereen was applied three times at the rate of two pounds per 
acre each time, making six pounds per acre in all. The dates 
of application were July 1, 5 and 26. In spite of the greater 
quantity of paris green used on the unsprayed rows bugs did 
slightly more damage here than on the sprayed rows. This 
supports the oft-repeated statement that bugs are more thoroughly 
controlled when the poison is applied with bordeaux than when 
the poison is used alone. 
When we examined the experiment on July 22, there was no 
late blight to be found even on the unsprayed rows. Yet there 
was a marked contrast between the sprayed and unsprayed rows. 
The latter were of a darker green color and had been less 
injured by early blight, which was quite plentiful on unsprayed 
