498 
Combating Lousiness 
(b) Experiments on clothing and straw conducted by Peacock (MS. Report, 
W.O. i. 1918 (Exps. 81, 82), vn. 1916, pp. 41, 50 (Exps. 83-87)). 
Ref. 
No. 
Insecticide 
tested 
Form of 
Experiment 
Result 
+ = all lice killed 
± = some killed 
o = survived for 
83 
N.C.I. powder (see ref. 
428, p. 537) 
Verminous shirt, dusted ... 
+ in 3 hrs 
84 
Ditto ... ... ... 
Verminous shirts in bundles 
of 10, dusted 
+ in 3 days 
85 
Ditto 
Straw on floor infested with 
500 lice, dusted. 3 clean 
men slept on the straw 
8 hrs later. [Men acted as 
traps] 
Same straw re-dusted and 2 
men slept on it on second 
night 
± overnight. Six living 
and 6 dead lice found 
on men next morning 
no lice found on them 
86 
“Powder of heavy oil 
residue (sulphonated) 
talc and aloes” 
Verminous shirts, dusted 
O 9 days 
87 
“White mercury pow¬ 
der” (advertised) 
Ditto. 26 g. dusted on 4 in¬ 
fested shirts 
O 4 days 
(i c) Experiments on Man. ' 
1. Under conditions supposedly simulating the natural. 
Note. The following experiments were carried out by Bacot (ix. 1916, 
pp. 447-450) by the method described on p. 507 in connection with 
the effect of insecticide vapours. The lice were confined near the body 
in gauze and wire cells containing lint treated with the insecticide to 
be tested. No experiments were made with nits. 
Ref. 
Insecticide 
Result 
No. 
tested 
+ = killed. ± = 
some killed. o = survived 
88 
Cresylie acid 
immobilized in 
3 hrs, all dead next day 
89 
Cytisine 
99 99 
3 hrs. ? killed 
90 
Iodoform 
99 99 
4 hrs. Mostly killed 
91 
Naphthaline 
+ 3 hrs 
92 
Vermijelli 
O 9 hrs 
