Gf. H. F. Nuttall 
513 
Tests a and b were started 1 hour and 24 hours after 
the pockets were anointed (deaths only recorded). 
Ref. 
No. 
Insecticide tested 
Lice exposed hours 
Lice exposed 12 hours 
a 
b 
327 
Parasitor, contains soap (average 
7 % dead 
12 % dead 
result with 4 samples) * 
328 
Vermijelli *t 
0 „ 
15 „ 
In Experiments 329-338 (Contact and Vapour) pieces of flannel 
were impregnated with the insecticide (quantity not stated) by being 
dipped therein and afterwards wrung out. The lice were confined 
upon the flannel by chifion through which they could feed, as in 
Experiments 286-328, when worn next to the skin during the* ex¬ 
posure period. 
Tests started (a) 1st and (b) 2nd day after flannel 
was impregnated. 
Ref. 
No. 
Insecticide tested 
Lice exposed 18 hours 
Lice exposed 20 hours 
tl 
b 
a 
b 
329 
Monochlor cresol, 7 \ % in alcohol | 
9/21 dead 
32/32 alive 
5/10 dead 
16/16 alive 
330 
Ditto, 5 % emulsified in castor 
oil soapj 
38/21 „ 
2/26 dead 
3/13 „ 
15/15 „ 
331 
Cresol soap solution, 5 % J 
8/22 „ 
1/15 „ 
3/15 „ 
15/15 „ 
332 
Carbolic acid (crude) soap solu- 
12/15 „ 
8/15 „ 
9/15 „ 
15/15 
tion, 5 %J 
1st day 2nd day 
slight sweating 
1st day 2nd day 
no sweating 
Tests carried out as under Experiments 329-332. 
Experimenter exercised in room at 37° C. to 
induce sweating. 
Ref. 
No. 
Insecticide tested 
Lice exposed 18 hours 
Lice exposed 20 hours 
333 
Monochlor cresol, 5 and 7J % in 
a b 
9/15 dead 16/16 alive 
a 
5/15 dead 
b 
16/16 alive 
alcohol | 
(5% sol.) 
(71% sol.) 
334 
Ditto, 5 % in soap sol. | 
13/16 dead 2/14 dead 
3/16 dead 
15/35 „ 
335 
Cresol soap solution, 5 % 
8/15 „ 1/15 „ 
3/15 „ 
15/15 „ 
336 
Carbolic acid (crude) soap solu- 
12/15 „ 8/15 „ 
1st day 2nd day 
9/15 „ 
15/15 „ 
tion, 5 % J 
1st dav 
4th day 
slight sweating 
no sweating 
Ref. 
No. 
Insecticide tested 
337 
Tar oil, light, crude 
Tested flannel after 3 days, killed 20 lice in 4 hrs 
6 15 2 
J? J J JJ )} 55 5? }> 
338 
Ditto, in soap solution 
1-2 
JJ J- ,, 
3-4 
?5 >> 5? ^ x >> 
„ lice m 2 hrs 
5 5 5 5 >5 
Cv 
55 55 55 w 55 
55 55 ^ 55 
* The effects of these mixtures are attributed almost entirely to contact action, 
t These percentages are somewhat fallacious, because only about 30 lice were used per experi¬ 
ment. 
I Experiments 329-336 show the influence of slight sweating on the part of the experimenter 
during the exposure period, the sweating greatly increasing the death rate in lice. All the lice 
survived on flannel tested on second day after it was impregnated when no sweating occurred. 
