99 
'The influence of these plots one upon the other is shown by the 
strong, upward course of the broken Hne from the ninth to the 
eleventh rows, and the downward course from the fourteenth to 
the twelfth. The short horizontal lines, one on each side of the 
diagram, indicate the average percentage of injury on check and 
experimental plots respectively, with the exception of rows eleven 
and twelve. The distance between the inner ends of these lines is 
a measure of the benefit resulting from the spray, and the distance 
from the inner end of each line to the point where the broken line 
crosses the vertical, is a measure of the influence of the other plot 
through the iniequal interchange of curculios. 
