1910 
July 10 
(No 5)
[July 10, 1910]

I include Holden's Hill, which is rather
badly eaten this season for the first time yet
nowhere completely stripped. There I found only
from 25% to 50% of the caterpillars deceased.
They were mainly free from disease on those
parts of Ball's Hill where the spraying had been
sufficiently thorough and effective to save most
of the foliage. Apparently it had killed just
enough of them to keep the survivors in
prime condition for propagating their kind this
month and making us serious trouble another
year. Thus it would seem that Prof. Riley was
fully justified in what he said to us in 1894
to the effect that the best way to fight gypsy
moths is to let them alone. I have felt all
along that it might be so but when, this year,