20 BULLETIN 907, U. S. DEPARTMENT OF AGRICULTURE. 
EXPERIMENT 22. 
Condition during fumigation, shade, 58° F. 
Condition before fumigation, shade, 59° F. 
Dosage, 14 ounces KON. 
Date, March 30, 1916, 8.15-9.05 a. m. 
Plants in each test, 3; total, 18. : 
Remarks: Plants in a slightly resistant condition. Maximum sun temperature 
76° F. Plants were removed from fumigatorium to cool shade for the period elapsing 
before placement into sunshine. 
Results. 
Condition after fumigation. 
Sun, 67° F.,| Sun, 68° F.,| Sun, 72° F.,| Sun, 74° F., 
Shade, Bun, eee | exposed exposed. exposed exposed 
“60° F. : BET after 30 after 1 after 2 after 3 
: minutes. hour. hours. hours. 
1 4 3 3 3 2 
EXPERIMENT 23. 
Condition during fumigation, shade, 65° F. 
Condition before fumigation, shade, 68° F’. 
Dosage, 14 ounces KCN. 
Date, March 30, 1916, 12.03-12.53 p. m. 
Plants in each test, 3; total, 18. 
Remarks: Plants in a slightly resistant condition. They were removed from 
fumigatorium to cool shade for period elapsing before placement into sunshine. 
Maximum sun temperature, 76° F. 
Results. 
Condition after fumigation. 
Sun, 77° F.,| Sun, 76° F.,| Sun, 74° F.,| Sun, 71° F., 
Sun, 76° F., exposed exposed exposed. exposed 
71° F. eves after 30 | after1 after 2 after 3 
a minutes. hour. hours. hours. 
ali 4 3 3 2 1 
In each of these four experiments all plants were removed from 
the fumigatorium immediately after exposure, part being placed at 
once in the sun while the remainder were held in the shade. Those 
plants which were exposed to the sunshine at different periods follow- 
ing fumigation were held in the shade at a cool temperature (60° to 
70° F.) between the time of their removal from the fumigatorium 
and placement in the sunshine.. Some plants were held continuously 
in the shade at certain temperatures as a check on the injury attribu- 
table to direct sunshine. 
It is seen by an examination of experiment 20 that the dosage used 
merely injured the very tenderest growth where plants were placed 
