. Bulletin of the Department of Agriculture. Agriculture. 20 BULLETIN 377, U. S. DEPARTMENT OF AGRICULTURE. The jars with the new type of sirup were visited constantly for 62 days, or to the conclusion of the experiment. The small amount of sirup left was still clean and as sweet as at first. Tests of the poisonous qualities of both liquids were made with colonies in Janet cages, under control as to food. There was prac- tically no difference in toxicity. Workers in both cages began to die in 4 days, the queens stopped ovipositing in 14 days, and winged males died very quickly, the queens
. Bulletin of the Department of Agriculture. Agriculture. 20 BULLETIN 377, U. S. DEPARTMENT OF AGRICULTURE. The jars with the new type of sirup were visited constantly for 62 days, or to the conclusion of the experiment. The small amount of sirup left was still clean and as sweet as at first. Tests of the poisonous qualities of both liquids were made with colonies in Janet cages, under control as to food. There was prac- tically no difference in toxicity. Workers in both cages began to die in 4 days, the queens stopped ovipositing in 14 days, and winged males died very quickly, the queens in 17 days. and the whole colony in each case was extermi- nated on the thirty-second PRACTICAL TESTS OF THE IMPROVED SIRVP. The new sirup, made exactly as in the for- mula given above, is very palatable to the ants at any season of the year. It was found that containers charged with it placed at selected points outside a residence would attract the ants and they would cease to invade the house. A private residence in a large plot of ground on a street corner with a row of large oak trees along each street was heavily infested with ants, which were to be found in the sink, the refrigerator, all over the floors, etc. On June 18, 6 cans each containing this sirup and a sponge were hung on the brick pillars which supported the house. The following morning there was scarcely an ant to be seen in the house and the ants were attending the sirup in large numbers. The same conditions existed throughout the length of the experiment, which was terminated on August 10. Many such small experiments have been conducted, the results being equally successful. APPLICATION OF THE SIRUP. The paraffin-covered paper bag1 shown in figure 4 is undoubtedly the cheapest container. It can be made in large quantities at a cost of about $5 per thousand. Small 1-pound bags used in grocery stores are ob- tained, and two or three holes about one-fourth inch in diameter are cut through each folded bag
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