BULLETIN 907, U. S. DEPARTMENT OF AGRICULTURE. 



EXPERIMENT 5. 



Condition during fumigation, dark, 64°-66° F. 



Condition after fumigation, dark, 60° F. 



Dosage, 1J ounces KCN. 



Date, May 17, 1916,, 6.07-6.57 a. m. 



Plants in each test, 7; total, 14. 



Results. 



Condition before fumigation. 



Dark, 

 64°-66° F. 



Dark, 

 90°-102° F.i 



2 



2 



1 5 hours before fumigation temperature raised from 70° to 90°-102° F. 



EXPERIMENT 6. 



Condition during fumigation, dark, 60° F. 

 Condition after fumigation, shade, 64° F. 

 Dosage, 1£ ounces KCN. 

 Date, March 30, 1916, 9.37-10.27 a. m. 

 Plants in each test, 5; total, 15. 



Results. 



Condition before fumigation. 



Sun, 67° F., 

 plants dry. 



Sun, 07° F., 

 plants wet, 

 water temper- 

 ature, 58° F. 



Sim, 67° F., • 

 plants wet, 

 water temper- 

 ature, 86°*F. 



1 



1 



1 



EXPERIMENT 7. 



Condition during fumigation, dark, 72°-73° F. 

 Condition after fumigation, shade, 65° F. 

 Dosage, 1 ounce NaCN. 

 Date, October 7, 1915, 12.10-12.50 p. m. 

 Plants in each test, 5; total, 15. 



Remarks: Plants exposed to the sunshine for several hours, then wet thoroughly 

 immediately before fumigation. 



Results. 



Condition before fumigation. 



Sun, 80° F., 

 plants dry. 



Sun, 80° F., 

 plants wet, 

 water temper- 

 ature, 64° F. 



Sun, 80° F., 

 plants wet, 

 water temper- 

 ature, 96° F. 



4 



3 



4 



All dry plants had the mature foliage quite severely burned, while only 3 of the 5 

 hot-water-treated plants were equally severely affected. None of the plants treated 

 with cold water were as severely injured as where dry. 



