118 REPORT OF THE BOTANICAL DEPARTMENT OF THE, 
as many rows. Nozzles are ahead of drive wheels. The gear and 
relief valve are so adjusted that the pump develops and maintains 
a 60 lb. to 80 lb. pressure.” 
It will be observed that according to Mr. Martin’s figures the 
gain from spraying was 135 bu. per acre instead of 127.5 as given 
in Table XVI. The rows were marked out with a 33-inch marker 
and the length being 924 ft. the number of rows required to make 
an acre would be 17.1, which is the number we have used in com- 
puting the yields. Mr. Martin states, however, that actual count 
shows that there were on the average 18 rows to the acre. He be- 
lieves that this comes about from the fact that the field was on a 
side hill and that in planting from the lower toward the upper side | 
the planter constantly slewed downhill a little so that the rows were 
brought closer together. 
It is noteworthy that the total yield of marketable potatoes on 
18 acres was 7510 bu., which is at the rate of 417 -+ bu. per acre. 
The variety was Sir Walter Raleigh. 
Experiment No. 3— Two men and one horse did the spraying | 
of the entire 20 acres in one day each time. The unsprayed rows 
blighted three weeks earlier than the sprayed. The unsprayed 
rows were not injured by “bugs.” There was no loss from rot. 
Experiment No. 4.— This experiment was conducted by Pardy 
Brothers near Plattsburgh. A strip of six rows was left unsprayed. 
A few rows on one side of the unsprayed rows were sprayed six 
times, but the greater part of the fygld was sprayed only five times. 
A row sprayed six times yielded at the rate of 235 bu. 12 lbs. per 
acre, while one of the unsprayed rows yielded only 122 bu. 41 Ibs., 
making the gain from spraying 112 bu. 31 lbs. per acre. A Station 
representative saw the unsprayed row dug and weighed, but the 
sprayed row had been dug before he arrived. However, he assisted 
in weighing the sprayed row. The sprayed and unsprayed rows had 
been treated alike in all respects except in the matter of spraying. 
The seed used in planting these rows consisted of cut pieces from 
large tubers. bs 
One other row, planted with whole small potatoes and sprayed 
six times, yielded only 170 bu. 49 lbs. per acre. This row stood 
next to the sprayed row which yielded 235 bu. 12 Ibs. per acre, and 
so far as known was treated like it in all respects except in the 
matter of seed. These two rows showed a difference in yield of 64 
bu. 23 Ibs. per acre in favor of the cut pieces from large tubers. 

