84 
The 4 trees not sprayed yielded 15.5 bushels of apples, and the 
4 trees sprayed yielded 23.9 bushels (Section i, Column 4), the 
bulk of the yield being thus 54 per cent, greater for the sprayed 
trees than for those unsprayed (Section 5, Column 8). In other 
words the trees which had been treated, yielded one and a half times 
as large a quantity of apples as those which had not been sprayed. 
The niimher of apples from the 4 trees not treated (Column 5) 
was 2,617, while that from the trees treated was 3,308 — a differ- 
ence of 26 per cent, in favor of the sprayed trees. That is, the 
sprayed trees bore a fourth more apples than those which had not 
been sprayed. We should notice, in passing, that the apples from 
the trees not treated ran 169 to the bushel, and that those from the 
treated trees ran 139 to the bushel — a difference of 21 per cent, in 
average size of fruit in favor of the sprayed trees. That is, the 
apples on the trees which had been sprayed were one fifth larger, 
on an average, than were those from the other trees. 
All these differences were apparent without any special exami- 
nation of the fruit with reference to injuries by curculios. When 
these curculio injuries were distinguished and tabulated (Column 
6), it was found that 92.2 per cent, of the apples on the unsprayed 
trees had been injured by curculios making feeding--pits, tgg punc- 
tures, or both, and that 28.6 per cent, of the apples on the sprayed 
trees were so injured. A simple calculation from these data shows 
(Section 5, Column 7) that 69 per cent, of the apples which would 
have been injured if no treatment had been applied, had been pro- 
tected from injury by the arsenate spray. 
Next, the total product of both lots of trees was separately and 
very carefully graded as No. I's, 2's and 3's, by the standards of 
the American Apple Growers' Association adopted in 1903, (Sec- 
tion 5, Columns 9, 10, and 11,) with the result to show that the 
4 check trees yielded i^ bushels of No. I's, and the 4 sprayed trees, 
17.16 bushels; that the check trees yielded 6.2 bushels of No. 2's, 
and the sprayed trees, 5^4 bushels; that 7.8 bushels of No. 3's were 
borne by the check trees, and 1.16 bushels by the trees which had 
been sprayed. (See Plates I. and II.) 
According to the best estimate we can make of the market 
values of these three grades, if the No. i apples sell for $1, No. 2's 
might be expected to bring 75 cents, and No. 3's, 25 cents or there- 
abouts. Applying these estimates to these various lots of apples, 
it appears that the actual value of the crop from the treated trees 
was 2% times that from the trees which had not been treated 
(Column 12). 
