14 BULLETIN 907, U. S. DEPARTMENT OE AGRICULTURE. 



EXPERIMENT 17. 



Condition during fumigation, shade, 60°-62° F. 

 Condition before fumigation, dark, 64° F. 

 Dosage, 1 ounce NaCN. 

 Date, September 21, 1915, 6.50-7.35 a. m. 

 Plants in each test, 5; total, 20. 



Results. 



Condition after fumigation. 



Dark, 64° F.i 



Dark, 80° F.2 



Shade, 70° F. 3 



Sun, 71° F.3 



2 



2 



2 



4 



1 Temperature 64°-68° F. throughout the day. 



2 Temperature 80°-91° F. during the day. 



3 Temperatures equal throughout the day; maximum 94° F. at 1 p. m. 



EXPERIMENT 18. 



Condition during fumigation, shade, 85°-89° F. 



Dosage, lj ounces KCN. 



Date, March 15, 1915, 11.20-12.20 p. m. 



Plants in each test, 2; total, 24. 



Remarks: Growth as in experiment 14. Plants placed in fumigatorium at tempera- 

 ture 70°-75° F. which was immediately raised to and maintained at 85°-89° F. during 

 fumigation. 



Results. 



Condition before 

 fumigation. 



Condition after fumigation. 



Dark, 

 56° F.i 



Shade, 

 79° F.2 



Shade, 

 90° F.3 



Sun, 

 85°F.4 



Dark, 56° F 



Shade, 76° F 



Sun, 83° F 



2 

 2 

 5 



3 

 3 



5 



3 



4 

 5 



4 

 5 

 5 





i Temperature practically uniform for day following treatment. 



2 Maximum temperature, 80° F. 



3 Temperature, 90° F. maintained for 4 hours. 



4 Maximum temperature, 86° F. at 1.30 p. m. 



EXPERIMENT 19. 



Condition during fumigation, shade, 78°-80° F. 



Condition before fumigation, shade, 76° F. 



Dosage, 1\ ounces NaCN. 



Date, November 2, 1917, 9.20-10.20 a. m. 



Plants in each test, 2; total, 6. 



Remarks: Plants hardened from growth in open. 



Results. 



Condition after fumigation. 



Shade, 74° F.i 



Shade, 87° F.2 



Sun, 87° F.2 



2 



2 



5 



1 Maximum temperature, 80° F. at 2 p. m. 



2 Maximum temperature, 93° F. at 1. p. m. 



