18 



closed no root-lice. On the 31st of May a few root-lice were found. 

 On the 6th of June an examination of two hundred hills dug up gave 

 the following averages : 



Check plots, 50 hills examined. Six hundred and tliirty-eight 

 adult ants, no ant larvae, 7 root-lice. 



Plot treated with half an ounce of kerosene to the gallon of seed, 

 50 hills examined. Two hundred and ninety-four adult ants, 400 

 larvae, no root-lice. 



Plot treated with three-fourths of an ounce of kerosene to the 

 gallon of seed, 50 hills examined. Six hundred and forty-one adult 

 ants, 500 larvae, 14 root-lice. 



Plot treated with a 10 per cent solution of oil of lemon at the rate 

 of three ounces per gallon of seed, 50 hills examined. Seven hundred 

 and thirty-two adult ants, 400 larvae, 26 root-lice. 



Taking the four plots together, 2,305 adult ants and 1,300 ant 

 larvae were found in two hundred hills, but these were accompanied by 

 only 47 root-lice. The last of June a large number of hills were dug 

 up in this field, but no root-lice were found. No injury was done to 

 the seed, and a good crop of corn was produced. 



Le Roy Experiment, Examination of June 6, 1907. 



Quantities per gallon of corn 



None (clieck) I 



y2 oz. kerosene | 



^ oz. kerosene 



3 oz. 10% solution oil of lemon. | 



No. hills 

 examined 



50 

 50 

 50 

 50 



Adult 

 ants 



638 

 294 

 641 

 732 



Ant larvae Root-lice 





 400 

 500 

 400 



7 







14 



26 



Experiment 2. — A 40-acre field, in corn the preceding year, was 

 selected because of the abundance of ants' nests noticed in following 

 the plow, these averaging a hundred nests to the mile of furrow. As 

 the plow used turned a 14-inch furrow, the above number of nests per 

 mile was approximately equivalent to seven hundred per acre. The 

 field was planted May 9 and 10, 24 rows with seed treated with three- 

 fourths of an ounce of turpentine to a gallon of seed; 24 rows with 

 half an ounce of turpentine to the sam.e; 16 rows with two ounces of a 

 ,10 per cent alcoholic solution of oil of lemon to the gallon ; 20 rows 

 with three ounces of the same to the gallon ; and 32 rows with three 

 ounces of a 10 per cent solution of oil of citronella to the gallon. 



Th^«eed in this field had begun to grow on the 17th of May, and 

 ants were iound at this time in the checks but not in the treated plots. 



