10 



Seventy-nine per cent infested by ants, and 91 per cent of these, or 71 

 per cent of the whole number, infested by root-lice. 



"Plot No. 9. Two counts in different parts. Forty-eight rows 

 planted with untreated seed. Four hundred hills examined, none va- 

 cant. Average number of plants to the hill, 3.18. Twenty-seven per 

 cent of hills infested by ants, and 79 per cent of these, or 21 per cent 

 of the whole number, infested by root-lice. 



"Plot No. 10. Fourteen rows planted with treated seed. Four 

 hundred hills examined, 167 vacant. Average number of plants to the 

 liill, 1.83. Fifty-eight per cent were infested by ants, and 70 per cent 

 of tliese, or 41 ])er cent of the whole number, infested by root-lice. 



"All counts were made in the central rows of the plots, and the 

 missing hills were not taken into account in calculating the average 

 number of plants per hill. Only hills infested with ants were examined 

 for root-lice. Tlie latter were not counted, liut were commonl\' com- 

 paratively scarce, l)eing very abundant in only two hills. 



"About forty acres of the field was included in this experiment, 

 twenty acres on the west side being planted with untreated seed. Tlie 

 plants in the untreated plots were uniformly stronger than those in the 

 treated plots. The ungerminated seed of the treated plots was swollen, 

 sour, and often covered with a greenish mold. \^ery often it had a 

 l)eculiar]y reddish discoloration of the seed-coat. In the seeds of the 

 first da\ 's planting (June 20) the swollen condition was disappearing 

 and the kernels were rotting and shriveling up. They had made no 

 start at germination. The company tests the germination of all the 

 seed it uses, and expects an average of 3.25 plants per hill. 



"I have detailed weather records for March, April, May, and 

 June. 1907, as kept by Mr. Perce, of the Bloomington High School. 



The record for the time of i)lanting and immediately afterwards 

 is as follows. 



