DOSAGE REQUIREMENTS. 
49 
Table IX. Recommended dosage, with 15-minute exposures Continued. 
trements oi 
tented I reea. 
Distance 
i\,t. 
71 
Circum- 
ference. 
F,,l. 
60 
65 
70 
80 
85 
<H> 
t><) 
65 
70 
7.". 
SO 
85 
on 
Area of 
leakage 
surface. 
Beighl Diameter 
o\ regularol regular 
figure figure 
wilh wiili 
foregoing foregoing 
measure- measure 
aents. 
incuts. 
Sq. feet. 
Feet. 
1,299 
31.5 
1,299 
81.0 
4,299 
3ft 6 
1,299 
30.2 
4,299 
29. 8 
4,299 
29. 3 
4,299 
2S. S 
1,534 
32. ."» 
4,534 
32 
4,534 
31.6 
4,534 
31,2 
4,534 
30. 8 
1,534 
30. 3 
4,534 
29.8 
Feet. 
i '.i. i 
20. 7 
22. 3 
23. 9 
L'7. (I 
28.6 
L9. 1 
20.7 
22 3 
23. 9 
25. 5 
27.0 
28.6 
Volume 
Cu. feet. 
8, 125 
9,300 
10,513 
11,726 
13,067 
14,237 
15, 171 
8, in 
9,635 
10,903 
12. L73 
13,579 
14,812 
It,. L13 
Ratio <>i 
leakage 
Burface 
to cubic 
contents, 
1.89 
2. 18 
2. 45 
2. 72 
3.03 
3.31 
3.60 
1 . 85 
2. 12 
2. II) 
2.66 
2 99 
3.26 
3 55 
Rate ol 
fix j 
cubic tasi "' '"'•"" ,| 
Tsar -ssb 
cyanld. 
121 
129 
134 
137 
Ml 
143 
146 
120 
128 
133 
136 
no 
143 
145 
Oil II, , 
r.7. 1 
71.3 
78. I 
85.6 
92. 7 
99. 5 
106.0 
70.0 
7.-, •_> 
82.0 
89 i 
07. 
103.5 
ill l 
EXPERIMENTS WITH BELL OR HOOT TENT. 
The boll or hoop tent used in these experiments was one constructed 
of 6J-ounce drill of the brand most commonly used in California. 
Owing to the form of the tent the leakage surface is far less in propor- 
tion to the volume than in the sheet tent. The data concerning the 
experiments and the recommended dosage based upon the experi- 
ments with the sheet tent are given in Table X. 
Table X. — Experiments in fumigation v:ith bell-shaped tent of 6\-ounee drill. 
Measurements of 
Amount of 
Ex- 
tented trees. 
Amount of 
Number of 
white 
Per cent of 
cyanid 
recom- 
peri- 
ment 
No. 
cyanid 
flies un- 
white (lies 
mended in 
Distance 
Circumfer- 
used. 
der obser- 
killed. 
table for 
over. 
ence. 
vation. 
•4.1 minutes' 
exposure. 
Feet. 
Feet. 
Ounces. 
Ounces. 
30.3 
2S! 
35 
4 
555 
88 
9 
40.5 
27" 
38 
4 
138 
88 
8* 
40.7 
33* 
38 
8* 
132 
80 
13 
40.10 
20 
23 
4 
300 
100 
•}', 
40.17 
2.5J 
27 
7 
47G 
100 
7" 
40.19 
24" 
20 
4 
209 
100 
5* 
40.22 
20 
22 
2 
162 
97.4 
4* 
45.2 
28 
29 
7 
427 
100 
8* 
45. 1 1 
20 
31* 
4* 
284 
100 
1\ 
15. 1 i 
31 
35 
■a 
289 
100 
10* 
45.16 
27* 
29 
431 
100 
8* 
45.18 
27 
34* 
9} 
595 
LOO 
8 
45.29 
29* 
30 
6 
530 
100 
91 
45.31 
23 
24 
31 
376 
98.7 
6 
50.3 
24* 
31 J 
4 
128 
97. 6 
7 
50.4 
34* 
37 
8* 
990 
llll) 
14 
60.8 
26 
31 
4* 
42 
85. 7 
7j 
X.2 
33 
35 
11 
200 
LOO 
121 
In these experiments a dosage sufficient to destroy all pup?p was 
used in eleven instances. The total amount of cyanid used in the 
eleven experiments was 7<S : > ounces, whereas the doses recommended 
in the tables, based upon the experiments with the sheet tents of 
8-ounce duck, together amounted to 96 ounce's. The average of the 
amounts used in the eleven tests was 7.2 as against 8.7 recommended 
