230 
Culicifuges 
Table IT. 
The Duration of the Period of Efficiency of certain Culicifuges. 
2 hrs after application 3 hrs after application 5 hrs after application 
Room No. of bites No. of bites No of bites No. of bites No. of bites No. of bites 
Prepara¬ 
tion used 
Quantity 
used 
Cage 
tempera- 
Date ture F. 
on treated 
arm 
on untreated 
arm 
on treated 
arm 
on untreated 
arm 
on treated 
arm 
on untreated 
arm 
Tested 
by 
1 
•75 gr. 
B. 
19. vii. 18 
71° 
12 
30 
— 
— 
— 
— 
A.B. 
1 
•75 „ 
A. 
15. vii. 18 
70° 
— 
— 
— 
— 
41 
17 
G.T. 
2 a 
1 
B. 
2. viii. 18 
69° 
8 
76 
— 
— 
— 
— 
A.B 
2 a 
1 
B. 
6. viii. 18 
f 69° 
170° 
27 
42 } 
— 
— 
— 
— 
G.T. 
5 
•75 „ 
A. 
23. vii. 18 
72° 
36 
37 
— 
— 
— 
— 
G.T. 
9 a 
1 
B. 
13. viii. 18 
75° 
29 
48* 
— 
— 
— 
— 
G.T. 
9 a 
•75 „ 
B. 
12. vii. 18 
70° 
— 
— 
— 
— 
50 
f not ) 
(controlled) 
A.B. 
9 b 
1 
B. 
23. vii. 18 
72° 
— 
— 
35 
46 
— 
— 
A.B. 
10 
•75 „ 
B. 
16. vii. 18 
71° 
49 
68 
— 
— 
— 
— 
A.B. 
11 
•75 „ 
A. 
19. vii. 18 
71° 
81 
( not ) 
| controlled] 
— 
— 
— 
— 
G.T. 
15 a 
1 
A. 
2. viii. 18 
69° 
37 
74 
— 
— 
— 
— 
G.T. 
15 a 
1 
B. 
30. vii. 18 
75° 
— 
— . 
21 
64f 
— 
— 
A.B. 
21 
1 
B. 
10. viii. 18 
75° 
27 
68 
— 
— 
— 
— 
A.B. 
22 a 
1 
A. 
16. ix. 18 
67° 
25 
19 
— 
— 
— 
— 
G.T. 
* Control made 10 minutes after test. f Control made within a few minutes of test. 
Of the preparations used in the tests shown in Table II, with the exception 
of the proprietary ones, Nos. 10 and 11 (which were unaltered), those not 
already made up with wax were recompounded in conformity with the 
others. This change was necessary in order to prevent their being at a dis¬ 
advantage in the long period trials in comparison with Nos. 1, 5, 10 and 11. 
X. COMPARATIVE EFFICIENCY OF THE PREPARATIONS TESTED. 
A percentage of the bites obtained in the trials set forth in Table II, out 
of the total number recorded gives an index to the comparative efficiency of 
these preparations. This index is shown in Table III. 
Table III. 
Index of Comparative Efficiency of Culicifuges . 
Preparation 
tested 
Time after application 
2 hours 3 hours 5 hours 
Percentage 
of bites 
Tested 
by 
1 
X 
- - 
28 
A.B. 
1 
— 
- X 
70 
G.T. 
2 a 
X 
— — 
9 
A.B. 
2 a 
X 
— — 
39 
G.T. 
5 
X 
— — 
49 
G.T. 
9 a 
X 
— — 
37 
G.T. 
9b 
— 
X — 
43 
A.B. 
10 
X 
— — 
43 
A.B. 
15 a 
— 
X - 
24 
A.B. 
15 a 
X 
— — 
33 
G.T. 
21 
X 
— — 
28 
A.B. 
22 a 
X 
- - 
56 
G.T. 
