18 
earth. To these burrows I applied about a tablespoonful of a solution 
of 1 part carbolic acid to 64 parts water. 
Result . — No ants appeared in the burrows, and no attempt was made 
to re-establish these burrows again. 
About two weeks later, a few burrows were excavated in the crevices, 
and these were treated in the same manner. The results were as fav- 
orable as before, and up to date (October 20), no ants have attempted to 
work in crevices of the walk. 
Experiment 2.— CARBOLIC ACID. 
Solution of 1 part acid to 128 parts water was applied to burrows, 
about two-thirds of a tablespoonful to each burrow. 
j Result . — In some cases, 24 hours after application, the ants had re- 
turned to work in the old burrows, but in most cases the burrows 
showed no signs of life. 
Experiment 3.— CARBOLIC ACID. 
Solution of 1 part acid to 96 parts water, applied as in Experiments 
2 and 3. 
Result . — Only in a single instance was any attempt shown to dig out 
the old burrows, and about this were a large number of dead ants that 
had been removed in re-excavations. 
A few attempts to excavate burrows in the vicinity of the old ones 
were observed a few days after first application, but these burrows were 
drenched as before, and no attempt was afterwards made to excavate 
between the crevices in that vicinity. 
Experiment 4.— COPPERAS WATER. 
Solution of 1 ounce to 1 pint water was poured into the burrows. 
Result . — Next day the ants were busily eu gaged in clearing out the 
old burrows. 
Experiment 5.— AMMONIA WATER. 
Solution of three tablespoonfuls to one gallon water was used, as in 
previous experiments. 
Result . — Same as in Experiment 4. 
Experiment 6.— TAR WATER. 
Drenched as in previous experiments. 
Result . — The ants did not attempt to clear out the old burrows, but 
excavated others close behind them. 
VIII.— Lettuce Aphis. ( Siphonophora lactucce Linn. 1) 
Experiment 1.— SALT WATER. 
Dissolved salt in water to its full capacity. Sprayed solution on 
lettuce plants infested, the aphids being on upright stalks and hence 
easily reached. 
