ABSORPTION OF HYDROCYANIC ACID. 
Table 7. — Hydrocyanic acid (parts per million) in fumigated flour . 
13 
Sodium 
cyanide. 
Number 
of times 
chamber 
was evac- 
uated. 
Hydrocyanic acid after 
Oday. 
lday. 
4 days. 
7 days. 
Oz. per 
lOOcu.ft. 
1 

1 
2 
3 

1 
2 
3 

1 
2 
3 

I 
3 
None. 
None. 
None. 
1 
1 
1 
None. 
None. 
0.8 
None. 
None. 
2 
50 
83 
83 
83 
33 
150 
50 
120 
100 
170 
200 
170 
2.5 
3.3 
8.3 
3.3 
None. 
3.3 
4.2 
6.6 
3.3 
6.6 
8.3 
3.3 
2 
None. 
2 
2 
4 
4 
None. 
None. 
None. 
.8 
.8 
.8 
None. 
4 
4 
6 
None. 
None. 
None. 
6 
6 
6 
Table 8. — Hydrocyanic acid (parts per million) in fumigated wheat. 
Sodium 
cyanide. 
Number 
of times 
chamber 
was evac- 
uated. 
Hydrocyanic acid after— 
Oday. 
lday. 
4 days. 
7 days. 
14 days. 
30 days. 
60 days. 
90 days. 
Oz. per 
lOOcu.ft. 
1 
1 
1 
1 
2 
2 
2 
2 
4 
4 
4 
4 
6 
6 
6 
6 

1 
2 
3 

1 
2 
3 

1 
2 
3 

1 
2 
3 
5.0 
4.2 
4.2 
3.3 
3.3 
3.3 
2.5 
3.7 
5.0 
3.3 
3.3 
6.6 
5.8 
5.0 
6.6 
3.3 
5.8 
6.6 
6.6 
2.5 
2.5 
2.5 
2.5 
3.3 
4.2 
2.5 
3.3 
5.0 
4.2 
4.2 
4.2 
3.3* 
5.8 
5.0 
5.8 
1.7 
1.7 
1.7 
1.7 
2.5 
3.3 
2.5 
3.3 
4.2 
4.2 
4.2 
4.2 
3.3 
5.8 
5.0 
5.8 
1.2 
1.7 
1.7 
1.7 
2.1 
3.3 
2.5 
2.9 
4.2 
3.3 
4.2 
4.2 
2.5 
5.0 
4.2 
4.2 
1.2 
1.7 
1.2 
1.7 
2.1 
2.1 
2.1 
2.9 
4.2 
2.9 
4.2 
3.3 
2.9 
5.0 
4.2 
4.2 
1.2 
1.7 
1.7 
1.7 
2.1 
1.7 
1.7 
2.1 
3.3 
2.9 
3.3 
2.9 
2.5 
4.2 
3.3 
3.3 
17 
21 
13 
13 
17 
25 
17 
17 
17 
25 
33 
25 
8.3 
6.6 
5.0 
3.3 
6.6 
6.6 
6.6 
8.3 
5.0 
6.6 
6.6 
6.6 
sipation, a very small quantity of the fumigant being present at the 
end of the 3-month experimental period in all but a few cases. 
The flour differed from the seeds in that, while it at first took up a 
large quantity of hydrocyanic acid, the union seems to have been 
extremely weak and by the end of four days, or, at most, a week, no 
traces of it could be found. 
Evacuating the fumigation chamber once, twice, or three times to 
get rid of the fumigant did not have much effect. In fact, a sample 
from the series in which the chamber had been evacuated two or three 
times frequently had a higher gas content than the corresponding 
sample in the series in which the chamber had not been evacuated. 
