142 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
same dates on which paris green was used with the bordeaux 
mixture on the sprayed rows. 
The test rows were dug with a potato digger October 5. The 
yields were as follows: 
Second sprayed row on the west, 458 lbs. marketable tubers. 
Second sprayed row on the east, 467 Ibs. marketable tubers. 
Average of two sprayed rows, 462% lbs. marketable tubers. 
Yield, sprayed, 254 bu. 55 lbs. marketable tubers per acre. 
Yield, unsprayed, 51 bu. 15 lbs. marketable tubers per acre. 
Gain, 203 bu. 40 lbs. marketable tubers per acre. 
The yield of culls was remarkably small being only 4 bu. 58 Ibs. 
per acre for the sprayed and 9 bu. 55 lbs. per acre for the un- 
sprayed. 
There was no rot whatever in this field either on the sprayed or 
unsprayed rows. The crop as a whole was an unusually satis- 
factory one. The tubers were uniformly smooth, clean, of good 
size and shape and perfectly sound. 
Field No. 2.—This field contained two acres of the vee Nor- 
cross, planted May 20. The dates of spraying were July 7, I1, 24, 
August 4 and 18. Three rows 831 feet long were left unsprayed. 
They were treated five times with paris green in the same manner 
and on the same dates as the unsprayed rows in Field No. 1. The 
test rows were dug October 5 with a potato digger. The yields 
were as follows: 
Second sprayed row on the west, 604 lbs. marketable tubers. 
Second sprayed row on the east, 649 lbs. marketable tubers. 
Average of two sprayed rows, 62614 lbs. marketable tubers. 
Middle unsprayed row, 138 lbs. marketable tubers. 
Vield, sprayed, 82 bu. 25 lbs. marketable tubers per acre. 
Yield, unsprayed, 40 bu. 11 lbs. marketable tubers per acre. 
Gain, 142 bu. 14 lbs. marketable tubers per acre. 
In this experiment there was a little rot and there was some- 
what more of it on the sprayed than on the unsprayed rows. The 
small and rotten tubers were weighed together, the yields being 
12 bu. 31 lbs. per acre for the sprayed and ro bu. 38 lbs. per acre 
for the unsprayed. 
Combining the results obtained in the two fieids we have an 
average gain of 172 bu. 57 lbs. marketable tubers per acre. How- 
ever, all of this gain should not be attributed to spraying. The con- 
