134 Report OF THE BOTANICAL DEPARTMENT OF THE 
The market price of potatoes at digging time was 60: cents per 
bushel. Sixty-seven bushels of potatoes at 60 cents per bushel 
would be worth $40.20. Subtracting $3.05, the cost of spraying, | 
there remains a net profit of $37.15 per acre. 
THE MATTITUCK EXPERIMENT. 
This experiment was conducted by W. H. Satterly at Mattituck 
in the eastern part of Long Island, 15 1-6 acres of potatoes being 
sprayed ten times. The potatoes were of the variety Green 
Mountain and in four lots. In one lot seven rows 657 feet long 
and three feet apart (4 acre) were left unsprayed for a check. 
The soil was a fertile sandy loam. 
The spraying was done with a one-horse “ Schanck ” sprayer 
manufactured by John R. Shangle, Hightstown, N. J. This 
sprayer differs radically from all others used in these experiments. 
It has neither force pump nor nozzles. The liquid is drawn off 
by gravity onto two rapidly-revolving disks which break it into 
spray and at the same time scatter it over the plants in all 
directions. Six to eight rows are sprayed at each passage. (See 
Plate XIII, fig. 1.) 
Bordeaux of the usual 6-4-50 formula was applied ten times at 
the rate of about 26 gallons per acre, on the following dates: 
First, June 13 and 14; second, June 21 and 28; third, June 28; 
fourth, July 4 and 5; fifth, Juiy 9 and 11; sixth, July 16, 18 and 
19; seventh, July 21 and 26; eighth, August 1 and 33 ninth, 
August 9 and 13; tenth, August 17. Paris green was applied 
with the bordeaux at the rate of about two pounds per acre 
whenever and wherever needed. Some portions of the field were 
treated oftener than others, but on an average three applications 
of poison were made. In all, 87 pounds of paris green were 
used. 
The check rows were treated three times with paris green in 
lime water; namely, on June 14 and 28 and July 11. 
The vines grew thriftily and soon covered the ground com- 
pletely. The unsprayed rows were attacked by both early and 
late blight, flea-beetles and plant lice. The first three were 
largely controlled by spraying, but the plant lice, of course, were 
unaffected by it. 
