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TENTH REPORT. 
syrup and tartar emetic exposed in a saucer where the ants could get at it. 
It is well known that rats will leave certain buildings where tartar emetic 
has been mixed with their food, the pain produced by the drug seeming to 
convey the idea that such a place is unhealthy as it no doubt is, and they 
leave. Ants, living in communities, as they do, seem to become suspicious 
and alarmed if any considerable portion of the family disappears or shows 
unusual symptoms. At any rate, they start to migrate and few if any ever 
get away, dying in numbers on the road. 
In our experiments, we aimed to produce the most attractive ant food to be 
had, and, having noticed the avidity with which ants sip up the beer and sugar 
which is painted on trees when sugaring for moths, we decided on beer and 
sugar as our basis. Beer was therefore percolated through sugar until a 
thick syrup was obtained. This was done in the absence of heat, so that the 
syrup has remained liquid ever since. To twenty parts of this, one part 
by weight of tartar emetic was added and to the whole a few drops of acetic 
ether to give the vinous odor so attractive to many insects. We have tried 
this mixture several times, and always with success. 
During the testing of both these remedies, we have been aided by Mr. 
E. J. Kraus, at the time Assistant in Entomology. 
Michigan Agricultural College. 
Received for publication April 4, 1908. 
