166 
Biology of Pediculus human us 
( b) Records which give the temperature hut not the stages or age 
of the lice experimented upon. Presumably the lice were of very differ- 
ent ages 
and both fed and unfed. 
Temp. 0 C. 
Conditions 
Longevity 
Authority * 
o 
o 
in thermostat 
12 hours ... 
Heymann 8 
37° 
carried in axilla ... 
1 day 
99 
37° 
41 lice in thermostat 
1 day . 
Hase 6 
36-5° 
not stated 
1 day 
Noeller 10 
35° 
50 lice, moist 
1£ days . 
Wilder 11 
29-33° 
moist 
5-7 days 
Engelhardt 2 
30° 
dry 
50 % dead in 1 day, others 
lived 2-3 days 
” 
30° 
moist ... ... __ ... 
3-5 days 
99 
28-30° 
carried on breast 
30-36 hours 
Heymann 8 
25-30° 
85 lice 
6 lice lived 2 days, none 
longer 
Hase 6 
25-28° 
carried on body. 
3-5 days 
Heymann 8 
22° 
not stated 
2 days at most ... 
Sikora 12 
O 
o 
dry 
2-4 days 
Engelhardt 2 
0 
O 
moist 
3-6 „ . 
,, 
o 
O 
several lice 
5 days 
Galli-Valerio 4 
16-18° 
not stated 
3 days at most ... 
Sikora 12 
15-17° 
dry 
4—5 days 
Engelhardt 2 
15-17° 
moist 
4-7 „. 
,, 
10-20° 
98 lice 
only 1 lived 7 daysf 
Hase 6 
10-12° 
not stated ... ... »... 
occasionally lived 9 days 
Heymann 8 
6° 
100 lice 
only 2 lived 9 daysj 
Hase 6 
5-5° 
not stated 
10 days ... 
Noeller 10 
5° 
5J 99 **• 
occasionally 10 days 
Heymann 8 
3-5-6° 
on infested shirt exposed to wet 
weather 
some lived 5 days 
Peacock 11 
f There survived respectively 90, 67, 37, 10, and 2 lice out of the original 98 on 
days 2-6. 
J There survived respectively 97, 93, 79, 54, 36, 18, and 11 lice out of the original 
100 on days 2-8. 
(c) Records which do not give the temperature, etc. 
Records mentioning the stages experimented upon but not the 
conditions. 
Stage 
Longevity 
Authority* 
1st stage larvae 
die in 36 hours 
Warburton 13 , Fantham 3 , Girault (1912, p. 339) 
9 9 9 9 
2-4 days 
Heymann 7 
Adults 
4-5 days at most 
Warburton 13 
99 * * ’ * *'• 
3 days 
Fantham 3 
* To avoid repetition, the references are arranged by numbers and given at the end of 
this section p. 170. 
