254 REPORT OF THE DEPARTMENT OF BOTANY OF THE 
Whenever “arsenite of soda stock solution’? is mentioned it 
should be understood to mean the stock solution prepared by the 
Kedzie formula— one pound white arsenic, four pounds sal soda 
and one gallon of water boiled together 20 minutes. 
By “test rows” is meant the rows used for determining the 
amount of the increase in yield due to spraying. These are, usually, 
the middle unsprayed row and the second sprayed row on either 
side. 
The yields given are for marketable tubers only. 
The price used in computing the value of the increased yield is, in 
every case, the market price for potatoes in the locality where the 
experiment was made, on the date on which the test rows were dug. 
THE BATAVIA EXPERIMENT. 
Conducted by G. A. Prole, Batavia, N. Y. Thirteen aeres 
variety Sir Walter Raleigh, were sprayed 4 times with a two-horse, 
home-made sprayer pumped by hand. In the first two sprayings 
one nozzle per row was used and five rows covered at each passage; 
in the last two, two nozzles per row and four rows covered. The 
dates of spraying were July 19, August.8, 23 and September 2. 
The bordeaux used contained 6 lbs. copper sulphate to 50 gals. 
water, with sufficient lime added to satisfy the potassium ferro- 
cyanide test. Poison for bugs (arsenite of soda, stock solution) 
was used with the bordeaux in the first spraying at the rate of two 
quarts to 50 gallons. The water required was pumped by a wind- 
mill 20 rods distant. There were three rows 1436 feet long by 32 
inches wide. They were treated with paris green once (July 19). 
The check rows died ten days earlier than the sprayed ones, owing 
chiefly to the ravages of flea beetles. 
The items of expense were as follows: 
aro lbs itepper: <ulphate w@sSers a... Tac, ceo ee ee See $24 96 
Avid 1, SG hO GAS Chay ches tide + dues Gale sieitab tes MO ae Cae ae I 00 
20 dbse sal. Usotla (ay “ate as n-ne ee 50 
5 {bs white arsenic) 15¢.s. 02 as ayn treaels piel ieee vis 
B days Jabor for*man () Sainvew 22. Gece en eee 10 00 
« days labor* for horsé’ @/Si4 ae eee eee 5 00 
Wear ion usprayeri veo ilane fee Geld. cea ieee ees Bet cree ea 5 00 
Totaleaees Po ves du bes ba Fel 5 ee Ree ton 2% 1s Or ee $47 21 
The yields of the test rows were as follows: 
Average of two sprayed rows, 694 lbs.—131.5 bu. per acre. 
Middle unsprayed row, 647 lbs.=122.6 bu. per acre. 
Gain due to spraying, 8.9 bu. per acre. 
