20 



Experiment 5. — A farmer's experiment in which a field of sweet 

 corn was planted June 12 and 13 in alternating strips with untreated 

 and with treated seed, oil of lemon being used, a pint to a gallon of 

 wood alcohol, and about three ounces of the mixture to the gallon 

 of corn. 



June 26 the corn was above the ground, and on the 5th of July 

 a hundred hills were dug up and examined, with the result that 2,205 

 adult ants, 2,070 larvae and pupae, and 763 root-lice were found in the 

 untreated part of the field, while in the treated part the adult ants 

 numbered 1,215, the larvae and pupse 11, and the root-lice 282. From 

 this it appears that there was some repellent elTect in the seed-corn 

 treatment in this field; but the weights of corn from an equal num- 

 ber of hills from treated and untreated plots showed no tangible dif- 

 ference in the yield, the ears from four rows of each weighing 

 between 2,100 and 2,200 pounds. 



The Spring IV eat her at Le Roy. — No precise data of rainfall at 

 Le Roy were obtainable for May and June, 1907, but the notes of the 

 field assistants are plain upon this point, as shown by the following 

 extracts : 



May 2 and 3, work in corn fields interrupted by rain. 



May 14, rained hard, packing the ground. 



May 17, heavy rain here at night. Hard rains have apparently 

 held the root-lice back. 



May 22, ground packed by hard rains and subsequent baking. 



May 28, rain stopped planting. "Big, heavy rains seem to have 

 killed the plant-lice. Have noticed reduction, in short, after each 

 heavy rain." 



May 30, cold and rains have reduced numbers of root-lice. 



May 31, rain preceding night interrupted corn planting. 



June 5, rain interrupted corn planting. 



June 6, recent rains have made fields too wet to plant. 



June'7, rained last night. 



June 9, wet weather doubtless the cause of poor condition of 

 corn. 



June 10, big storm. 



June 22, observations stopped by rain. 



June 26, corn in low ground apparently killed by water. 



June 27, field too wet to cultivate. 



July 9, corn on unfilled field very poor because of wet weather. 



The fields under observation and experiment were planted Mav 

 9. 10. 11, 13, and 14; May 22, 23, 28, and 30; and June 11. 14, 18. 

 and 19. 



