12 



BULLETIN 907, U. S. DEPARTMENT OF AGRICULTURE. 



Results. 





Condition after fumi- 

 gation. 



Shade, 

 65° F. 



Sun, 



65° F. 



Foliage drenched with water 



Foliage dry 



2 

 2 



4 



4 





EXPERIMENT 12. 



Condition during fumigation, dark, 64°-65° F. 

 Dosage, \\ ounces KCN. 

 Date, March 18, 1915, 10.50-11.50 a. m. 

 Plants in each test, 2; total, 30. 



Remarks: Fumigatorium contained ice to maintain a low temperature. This 

 absorbed much gas. 



Results. 



Condition before fumigation. 



Dark, 60° F.. 

 Shade, 60° F. 

 Sun, 73° F.-- 



Condition after fumigation. 



Dark, 



Shade, 



Dark, 



Shade, 



Sun, 



60° F. 



60° F. 



90° F.J 



88° F.i 



75° F.2 



2 



2 



3 



3 



3 



2 



2 



3 



3 



3 



2 



2 



4 



4 



4 



1 Temperature maintained 4 hours after treatment. 



2 Maximum temperature for day, 77° F. 



EXPERIMENT 13. 



Condition during fumigation, dark 66°-68° F. 



Condition before fumigation, shade, 66° F. 



Dosage, 1 oimce NaCN. 



Date, November 17, 1917, 9-10 a. m. 



Plants in each test, 4; total, 12. 



Remarks: Plant foliage tender. 



Results. 



Condition after fumigation. 



Shade, 68° F. 



Shade, 79° F. 1 



Sun, 79° F.i 



2 



2 



5 



1 At equal temperatures throughout the day. Maximum 98° F. at 2 p. m. 



All foliage on plants in the sunshine was destroyed, while those in the shade exhib- 

 ited injury only to the tenderest growth. 



