152 REPORT OF THE BOTANICAL DEPARTMENT OF THE 
$19.93. After deducting the cost of spraying, $2.62, there remains 
anet profit of $17.31 per acre. 
Notwithstanding the fact that there was much rot on the sprayed 
rows in both tests and an extremely low yield in one test the spray- 
ing was successful and profitable. However, had there been no 
unsprayed rows for comparison it would have been pronounced a 
flat failure. This experiment shows the unreliability of conclusions 
drawn from results obtained in fields where there are no check 
rows. They who wish to learn definitely the benefit from spraying 
must leave unsprayed rows for comparison. 
THE HEBRON EXPERIMENT. 
This experiment was conducted by Walter B. Shaw, Hebron, 
Washington county. The conditions were not entirely suitable for 
such an experiment and Mr. Shaw was reluctant about undertaking 
it, but finally consented as no better location could be found. Very 
little potato spraying has been done in Washington county. 
Six acres of potatoes, variety unknown, were sprayed twice very 
thoroughly by what we call the two-hose-and-three-men method. A 
Myers barrel spray pump was mounted in a fifty-gallon barrel 
drawn through the field on a one-horse cart. One man on the cart 
drove and worked the pump while two other men walking behind — 
the cart directed the nozzles attached at the ends of two long leads 
of hose from the spray pump. Four rows were sprayed at each 
passage through the field. The dates of spraying were August 2 
and August 25-26. The bordeaux was prepared by the 6-6-54 
formula and water for making it was obtained from a brook at one 
side of the field. Paris green was used with the bordeaux in the 
first spraying but not in the second. On the unsprayed rows, of 
which there were two sets of three rows each, paris green was 
applied August 3 by means of a powder gun. Owing to the delay 
in receiving the copper sulphate it was necessary to make one appli- 
cation of paris green over the entire field, check rows included, 
before any spraying was done. This application was made with 
a powder gun. 
Both on the sprayed and unsprayed rows bugs were kept under 
control. It was plain that the paris green had been more effective 
