DOSAGE REQUIRED l-.\ I B. 
48 
Deductioris concerning effectivi dosage. In formulating a definite 
table of dosage requirements from the above experiments the most 
significant results are (hose in which the amount of cyanid used was 
sufficient to destroy all but a very small percentage of the insects. 
Table Vgives more complete data concerning the foregoing experi- 
ments, in which from 95 to 99.9 per ccn! of the insects were killed; 
also, for comparison, it gives the dosage called for by tables pre- 
pared by t he author. 
Table V. Data concerning dosage in those experiments in which 95 to 99.9 per cent of 
white flies were destroyed. 
Measurement a 
of tented 1 pee. 
Approx- 
Experi- 
ment 
No. 
imate 
Dis 
Cir- 
capacity 
oi in 
tance 
cumfer 
closed 
over. 
ence. 
space. 
Feet. 
Feet. 
Ou. ft. 
30.5 
:,(i 
2, lis 
■in. in 
18 
46 
2.080 
in. 8 
:■ 
58j 
;;.:,si 
li >. ll 
63 
4,290 
40. 12 
514 
.a 
5,338 
15.20 
33 
50 
1 . 862 
15. 22 
as 
46 
2.0S0 
45 
50 
3,046 
4.".. 28 
46 J 
50 
3,194 
4.".. :, 
till'. 
4.238 
4:.. 3 
47 
50* 
3,397 
33* 
38 
1.297 
6a 21 
41" 
55 
3,027 
BO. 1 
51 
60* 
4,867 
6X.4 
34 
40" 
1.890 
■X. 1 
43* 
56 
3.412 
i rfX.H 
a 
53 
3.272 
«X. 5 
54 
3.713 
;x. 3 
m 
54 
3,713 
Approx- 
imate 
leakage 
surface 
Sq.ft. 
1.II7.". 
1,134 
1,554 
1,625 
2,082 
855 
1,134 
1,590 
1,697 
1,'734 
881 
1.320 
2, 042 
908 
1,485 
1,625 
1.771 
1,771 
Ratio of 
leakage 
Amount 
surface 
cyanid 
to cubic 
use.!. 
contents. 
Ov/nces. 
L:2.28 
Hi', 
1:1. 83 
13* 
1:2.30 
m 
1:2.65 
25 
1:2.56 
30? 
1:2. 17 
12* 
1:1.83 
13* 
1:1.88 
20* 
1:1.88 
24', 
1:2.49 
26* 
L:l. 95 
22 
1:1.47 
8* 
1:2.29 
1:2.38 
30* 
1:2.08 
15 
1:2.29 
22* 
1:2.01 
17* 
1:2.09 
24* 
1:2.09 
28* 
Rate: 
Number 
cubic feel 
per ounce 
cyanid. 
lis 
1 54 
207 
171 
171 
I 40 
154 
lis 
130 
160 
154 
152 
121 
160 
126 
156 
IS'I 
151 
130 
\moiinl 
Kale: 
c\ anid 
Number 
recom- 
cubic i <•«■ t. 
mended 
per ounce 
in table 
cyanid 
given in 
recom- 
appendix 
mended. 
Ounces. 
20 
122 
171- 
119 
29 
123 
32* 
131 
41 
130 
15 
124 
17* 
119 
25 
122 
26* 
120 
32 
132 
28 
121 
13 
Kin 
24 
126 
38 
128 
15* 
122 
26* 
129 
27* 
110 
30 
123 
30 
\i:\ 
a One of several trees fumigated on night of March 1, 1907. Unsatisfactory results supposed to be due 
to poor quality of acid. 
6 Exposure, l hour and 45 minutes, 
e Exposure, 2 hours and 50 minutes. 
d Exposure, 1 hour and 30 minutes. 
e Exposure, l hour and 35 minutes. 
/Exposure, 1 hour and 55 minutes. 
For purposes of comparison with Table V, the data on the dosage 
experiments in which all of the insects were believed to have been 
killed in forty-five-minute exposures are given in Table VI, which, 
like the preceding, includes the rate and amount of dosage calculated 
according to the dosage recommendations hereinafter given. 
