246 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
ADDITIONAL NOTES ON THE VOLUNTEER EXPERIMENTS IN 1908. 
Experiment No. 1. Mr. Dennis states that the sprayed and 
unsprayed rows had an equal chance except as regards spray- 
ing. The unsprayed rows were not injured by bugs, yet they 
died four weeks earlier than the sprayed rows. ‘The fact that 
a considerable number of rotten tubers were found at digging 
time indicates that late blight was a factor in this experiment. 
Flea beetles were not troublesome. 
Experiment No. 2. It is not clear how spraying benefited 
the plants in this experiment. Although there was a marked 
contrast between sprayed and unsprayed rows Mr. Miller thinks 
there was no blight and the unsprayed rows were only slightly 
injured by bugs. Plant lice were plentiful. 
Experiment No. 3. The total quantity of bordeaux used on 
18 acres was 25,685 gallons, which is at the rate of 1,427 gal- 
lons per acre. A few rows which were double-sprayed each 
time, receiving bordeaux at the rate of 2,854 gallons per acre, 
outyielded the single-sprayed rows by 38 bu. per acre. Mr. 
Martin’s experience shows that there is little danger of in- 
injuring potatoes by the most thorough spraying. Early and 
late blight were both absent and there was no rotting of the 
tubers. The unsprayed rows were well protected against bugs 
by several applications of paris green, but tip burn was preva- 
lent and flea beetles and several other kinds of insects were 
numerous. The items of expense of spraying 18 acres were 
as follows: 
20 cwt. copper sulphate @ $5.875.... 25.2256. 026005..0.3.5. $117.50 
23 bbls. Ohio Marblehead lime @ $1.05..................... 24.15 
28 days labor, 'man ‘and team;"@ $300,010.14 -- su. ee ak 84.00 
Tncidentala. ga 20)i eve a A es ae os 8.35 
Total Pe Se ee pee er eee rte ot ores 0G ue $234 .00 
Experiment No. 4. There is some doubt about this experi- 
ment being a fair one. In the rush of haying the potatoes 
were neglected and the whole field was considerably injured 
