512 
Combating Lousiness 
Tests a, b and c were started 2, 24 and 48 hours after 
the pockets were anointed (deaths only recorded). 
Eef. 
No. 
Insecticide tested 
Lice exposed —4 hours 
a 
b 
c 
317 
Naphthaline and soft soap, 3: I t 
83 % dead 
50 % dead 
43 % dead 
318 
Ditto, whizzed* and soft soap, 
100 „ 
84 „ 
77 „ 
3: It 
* 
319 
Ditto, unwhizzed, drained* and 
97 „ 
87 
87 „ 
soft soap, 3 : It 
Tests a, b, c and d were started 1, 48, 144 and 168 
hours after the pockets were anointed (deaths 
only recorded). 
Eef. 
No. 
Insecticide tested 
Lice exposed for 
a 
b 
C 
d 
4 hrs 
5 hrs 
4 hrs 
9 hrs 
320 
Naphthaline, crude, and soft 
soap, 9 : It 
Ditto, crude, unwhizzed and soft 
97 % dead 
69 % dead 
22 % dead 
63 % dead 
321 
100 „ 
87 „ 
16 „ 
81 „ 
soap, 3 : It 
Tests a—d were started at once, 24, 72 and 144 hours 
after the pockets were anointed. 
Ref. 
No. 
Insecticide tested 
Lice exposed 4£—5 hours 
a 
b 
c 
d 
322 
Naphthaline and Oxford grease, 
3: It 
76 % dead 
13 % dead 
0 % dead 
3 % dead 
323 
Naphthaline, crude, with soft 
soap and Kieselguhr (85 :10 : 1 
ptsjt 
94 „ 
68 „ 
22 „ 
31 „ 
324 
Stoner’s Parasite Destroyer (a 
powder consisting apparently 
of sulphur, horacic acid, naph¬ 
thaline and a little sassafras 
oil) t 
76 „ 
31 „ 
0 „ 
0 „ 
Tests a and b were started 24 and 72 hours after 
the pockets were anointed. 
Eef. 
No. 
Insecticide tested 
Lice exposed 5—7 hours 
325 
Naphthaline 174%, safrol 2£ % 
a 
27 % dead 
b 
0 % dead 
Oxford grease 80 %+t 
326 
Naphthaline 17| %, chlor-cresol 
24 „ 
0 „ 
2% %, Oxford grease 80 % ft 
* For explanation see footnote p. 537. 
t These percentages are somewhat fallacious, because only about 30 lice were used per experi¬ 
ment. 
t The effects of these mixtures are attributed almost entirely to contact action. 
