THE ARGENTINE ANT: DISTRIBUTION AND CONTROL. 19 
The Nickels sirup! was then drained from its jar and was found 
to weigh 160 grams. The jar and crystals were then weighed, the 
crystals dissolved out of the jar, and the weight of the jar subtracted 
from the total weight. of the jar and crystals. It was found that 333 
grams of sugar crystals were present. . 
Grams, 
Weicht ob sirup, when first made. 22)ue) 3 ea hue GEO 23 
Weight of sirup remaining > SUSE CLyStals 12 Was ie Cea ab Ate 493. 00 
Water passed off by evaporation. _______-- _-+_-~_____-_ 167. 23 
The 660.23 grams of sirup contained 1.333 grams of sodium arsenite with a 
poison content of 0.202 per cent. 
The 160 grams of sirup remaining contained 1.333 grams of sodium arsenite. 
The poison content was now 0.836 per cent. 
The sirup with tartaric acid had a small precipitation. As the 
Brix had been raised 7.4 per cent through evaporation, the poison 
content was very slightly 
raised. This sirup now 
weighed 648.35 grams, the 
color and sweetness being still 
quite stable. 
Immediately after prepar- 
ing these two sirups, April 
23, 1914, 2 fruit jars of each, 
containing 1} gills of sirup. 
apiece (without honey), were 
set out along heavy ant trails 
in the Horticultural Hall. 
Absolutely clean and odorless 
sponges were used. 
For the first 4 days the ants 
showed a preference for the 
old type of sirup (without 
the tartaric acid) but for the 
Fie. 2.—Comparison of the improved sirup (right) 
next 21 days they showed no with the Nickels sirup (left), showing the amount 
preference. Then one jar of of sirup left a each and the amount of sugar in 
5 the Nickels sirup. (Original.) 
the old sirup was abandoned. 
This proved to be partially decomposed. On moving to another spot 
it was attended for 10 days more, then abandoned completely. Thus 
for a total of 35 days this jar attracted the ants. Seven days later 
the other jar of this sirup was abandoned and no matter where placed 
neither jar had any attraction for the ants. 
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1 Figure 3 shows the small quantity of sirup that still remained, as well as the large 
bulk of Sugar crystals which had formed in the jar. The jar containing the acidified 
sirup is placed at the side for comparison. 
