Gr. H. F. Nutt all 
169 
Further experiments may give more accurate information, but the 
general result is conclusive in so far as it proves that lice live longest 
at a low temperature and that life is somewhat prolonged by a damp 
atmosphere under the conditions specified. The influence of feeding 
prior to a fast in corf oris larvae was only apparent when they were 
kept at 20° C., otherwise there was no material difference in the longevity 
of the once-fed and unfed insects. 
Longevity of Lice (Adults) when Fed. 
In the following protocols, the age, in all cases, is reckoned from the 
last ecdysis. 
(a) Longevity of corporis when gorged once daily. 
No. of lice Sex Conditions Longevity Authority* 
1 $ ? in tube on person ... 21 days ... Fantham 3 
2some” $ ? in thermostat at 28° C. 30 ,, ... ... Swellengrebel, 1916, p. 4 
whilst laying 
( b) Longevity of corporis when gorged twice daily. 
No. of lice 
Sex 
Conditions 
Longevity 
Authority * 
2 
3 
on cloth in tube, near per¬ 
son 
17 and ca. 21 days. 
Warburton 13 
1 
9 
ditto (with <J) ••• 
30 days 
99 
“some” 
3 
at 30° C. in thermostat 
15-16 days 
Hindle MS 
99 
9 
at 22° C. 
24^28 „ 
99 
6 
9 
at ca. 24° C. in pocket by 
day and at ca. 35° C., 
near person at night, 
whilst laying 
respectively 21, 
25, 36, 37, 37 
and 45 days 
Sikora, vni. 1915, p. 528 
5 
3 
under same conditions as 
above 
respectively 21, 
28, 30, 31 and 
35 days 
99 99 99 
* To avoid repetition, the references are arranged by numbers and given at the end of 
this section p. 170. 
(c) Longevity of corporis, capitis + corporis (1st generation of 
hybrids) and capitis, when fed by Bacot’s method (see p. 110) during 
6-7 hours out of the 24; carried next to the body at night, in the waist¬ 
coat pocket by day. The sexes were kept together and the females 
oviposited. 
