494 
Combating Lousiness 
SUB-SECTION I. EXPERIMENTS WITH PEDICULICIDES 
AND REPUTED REMEDIES. 
The following records relate to experiments conducted by various 
authors including the writer, the different observations being accompanied 
by numbers in the first column to facilitate reference. The insecticides 
tested are mostly given in alphabetical order, and the attempt has 
been made to condense the records as far as possible through the use of 
signs and abbreviations. These are explained at the head of the tables. 
It remains to be noted, however, that the fractions §, f, etc., accompanied 
by the words “survived,” “killed,” or the like, serve to denote the 
number of insects tested in individual experiments; thus “■§ survived” 
means that 3 out of 5 insects survived exposure to the insecticide. 
A. Experiments with corporis (Nits and Lice) 1 , 
Experiments wherein corporis were immersed in various 
insecticides, usually in vitro. 
Methods. In my experiments the nits tested had been laid on hair 
during the preceding 24 hours. The insecticide was poured upon the 
nits placed in small covered glass dishes whence they were removed 
with fine forceps after exposure, drained on filter paper, and placed at 
30° C. to see if they hatched. The exposure was timed with a stop¬ 
watch. 
The other authors cited in the table (Peacock excepted) do not 
state how their experiments were conducted. 
Ref. 
No. 
Insecticide 
used 
At ° C. 
Stage 
tested 
n. =nits 
1. = lice 
ii ii ii 
+ -H O 
Result 
killed in ' = mins, 
some killed in 
survived exposure of " = secs. 
Authority. 
Key to ref. 
at end of 
table 
1 
Acetic acid, pure 
n. 
+ 
15' [of no practical import] 
s. 
2 
Alum, 10 %, cold 
i. 
o 
48 hrs. Two infested shirts 
soaked, afterwards rinsed 
in water and worn 
p. 
3 
Anise, oil of, in 
30 % alcohol 
— 
n. 
+ 
2 hrs . 
s. 
4 
Anisol 
— 
i. 
+ 
2 hrs . 
s. 
5 
Benzine ... 
19° 
n. 
o 
60" if survived ... 
N. 
6 
99 ••• ••• 
19° 
n. 
o 
00" f „ . 
N. 
.. v 
99 • • • *• • 
19° 
n. 
o 
10' f „ . 
N. 
8 
99 *•• • • • 
— 
n. 
± 
25' Ar „ . 
S. 
9* 
Carbolic acid, 24 % 
19° 
n. 
o 
2¥ £ „ . 
N. 
* Add: 3—5 % carbolic acid in soap solution kills 1. and n. in 2 hours (Hase 1916 a). 
1 The term “lice” is used throughout the tables to denote the active stages. 
