200 REpPoRT OF THE BOTANICAL DEPARTMENT OF THE 
The chief advantage of this formula over the one recommended 
by Kilgore is that the union of the arsenic and lime is more cer- 
tainly accomplished. : 
Both the Kilgore and the Kedzie formulas are now used to a 
considerable extent. Prepared by either formula, white arsenic 
is a cheaper poison than paris green, quite as efficient and settles 
to the bottom of the spray tank less readily. For these reasons 
it is coming into popularity with orchardists and potato growers, 
although its use sometimes results in injury to the foliage. 
THE EXPERIMENT WITH PARIS GREEN. 
PLAN AND METHODS. 
The experiment included 25 rows of potatoes 290.4 feet long 
and three feet apart, each row having an area of one-fiftieth acre. 
The potatoes were of the variety Rural New Yorker No. 2. ‘They 
were planted by hand May 27, 15 inches apart in the row. Hach 
row received ten pounds of commercial fertilizer applied by hand 
as uniformly as possible in the furrows before planting. The 
potatoes came up uniformly and well making nearly a full stand 
of plants. 
The 25 rows were divided into five series of five rows each and 
each series was sprayed in a different manner as follows: 
Series I. Rows 1, 6, 11, 16, 21. Check. Not sprayed. Bugs 
hand picked, 
Series II. Rows 2, 7, 12,17, 22. Sprayed 4 times, paris green 
in water. 
Series ITI. Rows 8, 8, 138, 18, 23. nae 4 times, paris ereen 
in lime water. 
Series [V. 4, 9, 14, 19, 24. Sprayed 4 times with paris green 
in bordeaux and once with bordeaux alone. 
' Series V. Rows 5, 10, 15, 20, 25. Sprayed five times wire bor- 
deaux alone. Bugs hand picked. 
The rows of Series I received no insecticide or fungicide of any 
kind. As soon as Colorado potato beetles appeared they were 
gathered by hand. Fortunately they were less numerous than 
usual, making it possible to control them completely by going 
over the plants every other day or, at most, once a day. 
