260 REPORT OF THE DEPARTMENT OF BOTANY OF THE 
The expense account contained the following items: 

250° lbs:+ copper 'sulphate?@ ‘Sizctmeers nt eee eee ee ee $21 25 
sootibs! limes: 2k) 20 ACRE sD ae Sd ee I 25 
mate" 1bs. “paris. gréén | @ 34.1 |. Use eeele ee oer eee ee Aes7 
SOvbre:-labor, imancarnd feam N@ 30¢. en 0. ee ee ee 15 00 
Wear ron: Sptayer yo ons ess acs so tnivgh' 6 alideeen = \su'¢.24 5) ca ais taetaelal eer 5 00 
EL OAL oo. aso pe eo © ue Sxienl pie ales site «> 2 2 te ahah ote en ei $47 07 
One test was in the variety Carman No. 3, the other in the variety 
Green Mountain. The yields were as follows: 
Test No: 1— Carman No. 3.—Average of two sprayed rows, 
500 lbs.==223.3 bu. per acre. 
Middle unsprayed row, 498 lbs.—222.4 bu. per acre. 
Increase in yield due to spraying, 0.9 bu. per acre. 
Test No. 2. Green Mountain.—Average of two sprayed rows, 
570 lbs.=254.6 bu. per acre. 
Middle unsprayed row, 347 lbs.==155 bu. per acre. 
Increase in yield due to spraying, 99.6 bu. per acre. 
Average gain in the two tests, 50.2 bu. per acre. 
At 50 cents per bushel the market value of this gain was $25.10. 
The expense of spraying being only $7.84 per acre the net profit 
from the operation was $17.26 per acre. 
Why the results were so widely different in the two tests is not 
known. The difference in variety does not account for it satis- 
factorily. Mr. Cook reports that in the test on Green Mountain 
the unsprayed rows were markedly inferior to the sprayed ones 
being more injured by late blight and tip burn. There was no early 
blight, no rot and no injury from bugs. 
THE OGDENSBURG EXPERIMENT. 
Conducted by Andrew Tuck, Ogdensburg, N. Y. Four acres of 
potatoes (variety, Rural New Yorker No. 2) were sprayed four 
times with a one-horse, four-row “ Aspinwall” sprayer carrying 
one nozzle per row. The dates of spraying were August 7, 16, 26 
and September 9. The bordeaux used was of the 5—5—s5o formula, 
the water required being pumped by hand from a well within a few 
rods of the field. There were three check rows, 600 feet long by 33 
inches wide. On July 31 the enttre field was treated with paris 
green in water. Subsequently, pais green was used with the 
bordeaux in all four sprayings while on the check rows it was ap- 
plied only twice — August 7 and 16. Throughout the season the 
