154 REPORT OF 'THE BOTANICAL DEPARTMENT OF THE 
In the orchard the yields were as follows: 
120 hills sprayed, 176 lbs., equal to 170 bu. 22 Ibs. per acre. | 
120 hills unsprayed,*® 116 Ibs., equal to 112 bu. 17 Ibs. per acre. 
Gain from spraying, 60 Ibs., equal to 58 bu. 5 Ibs. per acre. 
In the raspberry plantation the yields was as follows: 
100 hills sprayed, 175 lbs., equal to 188 bu. 18 Ibs. per acre. 
100 hills unsprayed, 123 lbs., equal to 132 bu. 17 lbs. per acre. 
Gain from spraying, 52 lbs., equal to 55 bu. 56 Ibs. per acre. 
Averaging the results obtained in the two experiments the 
gain due to spraying is 57 bushels per acre. 
In the raspberry plantation, blight was kept completely under 
control, but in the orchard there was some blight among the 
sprayed plants. Nevertheless, the sprayed plants here outlived 
the unsprayed by more than two weeks and the difference would 
have been still greater had not the sprayed plants been killed by 
frost. The unsprayed rows were not injured by bugs, and 
there was but little rot anywhere. 
Mr. Dobson believes that the secret of success in spraying 
potatoes is in commencing before the blight appears and doing 
the work thoroughly. 
The market price of potatoes at digging time was 65 cents. 
EXPERIMENT No. 16. 
Conducted by D. S. Norris, West Rush, 12 miles south of 
Rochester. Four and one-half acres of potatoes, Carman No. 3, 
were sprayed eight times using in all 29 barrels, of bordeaux 
mixture. The dates of spraying were July 16, 25, 29, August 
6, 13, 17, 27, and September 3. In the center of the field four 
rows 8114 rods long, three feet apart, were left unsprayed. 
The spraying was done with a home-made outfit covering four 
rows at a time with one Vermorel nozzle per row. The wheels 
were taken from an old grain drill; pitman and crank from an 
old binder; pressure gauge, relief valve, sprockets and chain 
purchased for the purpose. All the parts together, excepting 
the pump, did not cost to exceed $10. The pump was an E.°C. 

In the orchard, the test hills were taken from the middle unsprayed row 
and the second sprayed row; in the raspberry plantation, from adjacent rows 
separated by a row of raspberries. 
