19 



On the 6th of June, on the other hand, ants were found in practically 

 every one of three hundred hills examined in the various experimental 

 plots, the numbers varying from 1,657 to 4,163 adults to each lot of 

 fifty hills, and the ant larvae from 850 to 2,500. Root-lice, on the 

 other hand, varied from 2 to 241 to each lot of fifty hills. The totals 

 of these insects for the three hundred hills are as follows : adult ants, 

 16,935 ; ant larvae, 10,200 ; root-lice, 776. 



The following table summarizes Mr. Davis's observations on the 

 condition of the field September 17. 



Final Table, Experiment No. 2 



Experiment 3. — A field of forty acres, the planting of which began 

 May 28, but was interrupted by rain, and recommenced May 30, but 

 again interrupted by rain. On the 6th of June, owing to the wetness 

 of the weather, fifteen acres of this field still remained to be planted; 

 and during the night between the 6th and 7th it rained again. This 

 remaining part of the field was presently planted with seed treated 

 with a 10 per cent alcoholic solution of oil of lemon, three ounces of 

 the mixture to the gallon of seed. 



On the 26th of June ants were numerous in this field, but no root- 

 lice were found. On the 3d of July thirty hills contained 300 adult 

 ants, 175 larvae, and 125 root-lice. October observations showed no 

 difference between the treated and the untreated parts of the field, 

 either in condition or in yield. 



Experiment 4. — Field planted on the 11th of May with seed 

 treated with carbolic acid at the rate of three ounces per gallon of a 

 solution in water, containing 2^ to 3 per cent of the acid. 



On the 15th of June a hundred hills infested with ants in this 

 field were dug up, and root-lice were found in only six of them. Later 

 counts of the stand showed no difference between the treated and the 

 untreated plots, and neither injury nor benefit had resulted from the 

 treatment. 



