90 
Turning next to the ratios of curculio injury to these Benoni 
apples (Column 6), we find that 21.4 per cent, of the fruit of the 
unsprayed trees had been injured by curculios, and 10.3 per cent, of 
that on the sprayed trees, 48 per cent, of the apples which would 
have been injured having been protected from injury by the arsen- 
ical spray. These Benoni apples were harvested in July, but were 
not graded into market classes. I consequently have no data as to 
the total money benefit of the spraying shown by this Plot II. 
On the other part of this orchard (Plot III.) sprayed six times 
(Sections 3 and 7), were 20 Ben Davis trees which are to be com- 
pared with an equal number of this variety left unsprayed as a 
check. From each of these lots again 3 trees were taken for critical 
comparison of the product of those sprayed with that of those un- 
sprayed (Section 3, Columns i, 2, and 3). The final count on all 
these trees was made September 17. The 3 trees not sprayed gave 
16^ bushels of apples, while the 3 trees sprayed yielded 22 bushels 
(Column 4) — an increase of 34 per cent, in quantity of apples as a 
consequence of the spraying. The 3 Ben Davis trees which had not 
been treated bore 2,770 apples, while the 3 treated trees gave 3,063 
(Column 5) — a difference of only 11 per cent, in favor of the 
treated trees. The unsprayed apples on these trees ran 170 to the 
bushel, and the sprayed apples, 139 to the bushel — a difference of 
24 per cent, in size of fruit in favor of the trees which had been 
sprayed. 
With respect to the curculio injury to these Ben Davis apples 
we find that 95.6"per cent, of the unsprayed fruit had been injured 
by curculios, and 30.7 per cent, of that sprayed ; or, in other words, 
that 68 per cent, of the apples which would have been injured had 
been protected from injury by the treatment received. 
Looking now to the quality of the fruit from these Ben Davis 
trees, which had been sprayed six times in all (Section 7, Columns 
9, 10, and 11), we find that the 3 unsprayed trees examined gave a 
yield of % of a bushel of No. i apples, while the 3 sprayed trees 
yielded 12.06 bushels; that the unsprayed trees gave 3^ bushels 
of No. 2's, the sprayed trees t,}^ bushels; that the unsprayed trees 
yielded 11^ bushels of No. 3's, and the sprayed trees 6^ bushels. 
(See Plates III. and IV.) Reducing these quantities to comparable 
money values by the prices already assigned, we find that the actual 
value of the crop from the treated trees was 2^/2 times that from 
the trees which had not been treated. 
Orchard 5 (Plot IV.). — In the third and last orchard on which 
I have to report, the check and the experimental sections do not cor- 
respond closely, the sprayed trees being all Winesap and Ben Davis, 
late varieties only, and the check lot almost entirely of early varie- 
