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in previous seasons in small numbers, but it has not been taken even in 
the adult form, in this locality till this summer, so that it seems more 
likely that it has been introduced in some way quite recently. 
TESTS OF ARSENITE OF AMMONIA. 
During the month of May I received instructions from Mr. Howard 
to make tests of an insecticide put on the market by Fr. Jac. Andres, 
of 25 Pearl street, New York, under the name of arsenite of ammonia, 
as agent for the Caspar Schneider Chemical Works. In due time the 
samples came from the New York firm and I proceeded to make such 
tests as were possible to determine both the effects upon various kinds 
of plants and its effectiveness in killing insects. 
On the morning of May 30, 1890, between 9 and 10 o’clock of a hot, 
sunny day, I sprayed the following plants with a view to giving a 
thorough test of the effect on foliage: 
Squash vines infested with Diabrotica vittata. 
Cucumber vines infested with Diabrotica vittata. 
Potato vines infested with Hpitrix cucumeris. 
Plum, Cherry, Box-elder, Willow, Eleagnus, Elm, Mountain Ash, 
Birch, Apple, Raspberry, beans, grass, and clover. 
The results were watched closely for a number of days but the record 
of June 2 gives the results for the entire set. On that day a careful 
examination was made of all the plants that had been treated and it 
was found that in no case could there be found any injury to the foliage, 
except possibly a slight injury to the elm and the beans, but the injury 
was so slight, if any, in these cases that it could hardly be charged with 
certainty against the arsenite. The solution in this case was as given 
in the directions, a tablespoonful to an ordinary pailful of water, and 
the conclusion was that with this strength it could be applied without 
danger to any of the above-named plants. 
On the squash vines and cucumber vines the beetles seemed much 
less abundant, but I was unable to find any dead insects around the 
vines. The hills treated, however, remained quite free from further 
trouble from these insects, while others in the vicinity were seriously 
affected. The failure to find dead beetles under the treated plants 
might easily result from the insects flying away after eating the poison 
to places of shelter and dying there. The same was true of the flea- 
beetle affecting potatoes. The beetles seemed much less abundant, but 
no dead ones could be found under the treated vines. 
While it was so late in the season that it was not expected that this 
test would give any definite results as to the effect on the codling moth, 
it is worthy of mention that the branches of the apple tree sprayed 
with the arsenite were loaded with apples, while the other portions of 
the tree were much less fully loaded. 
The apples also of this portion were quite free from worms, though 
in the late fall they were of course exposed to the action of the second 
