G. H. F. Nuttall 
100 
pages to avoid needless repetition in detailing the conditions under 
which insects under experiment were kept 1 . 
( b ) Raising methods where the opportunities of feeding on 
man are limited and the surroundings but moderately 
normal. 
Raising Corporis. 
Warburton (1911, pp. 23-37), after unsuccessful attempts to raise 
corporis away from the body, succeeded as follows: he placed the insects 
on pieces of cloth in a cotton-plugged tube which he carried in his pocket. 
The lice were fed twice daily, by removing the cloth with the vermin 
clinging to it and placing it upon the back of the hand where they fed 
without leaving the cloth. Fantham (1912, pp. 513-515) appears to 
have merely followed Warburton’s method. 
Nicolle, Blaizot and Conseil (1912, pp. 110-192; 10. vn. 1912, 
p. 1636, and hi. 1913, p. 210), in Tunisia, kept lice alive for 3-4 weeks 
by feeding them twice daily on man, and, between feeds, keeping them 
in a damp atmosphere in the thermostat at 28° C. They state that 
few lice died under these conditions. 
Hindle has raised many generations by this method and so have I, 
the temperature ranging from 28-37° C., the best temperature being 
about 30-32° C. As 1 have stated elsewdiere (p. 89), body-lice dwell 
normally in a very dry atmosphere, and we, in England, have found it 
unnecessary to render the air moist in the thermostat. The lice may 
be kept in open bottles or tubes containing a piece of cloth for them to 
cling to; we have used bits of black sateen as they afford a good con¬ 
trast for eggs and small larvae. For some purposes I prefer small 
hair frames to cloth; they are more convenient for accurate inspection: 
but for ordinary purposes cloth is better; the lice cling to the cloth 
or hair, before, during, and after feeding. Lice are most conveniently 
fed upon the bared left forearm. It is best to sit facing a window in a 
good light, as young lice are small objects which may otherwise escape 
notice. - A fine camels’ hair brush or very finely pointed soft-springed 
forceps are used for picking up the insects that may wander or such 
as are required for examination. 
x Zupnick (v. 1915, p. 564), who failed to raise corporis under different conditions in 
the laboratory, finding that at best only a few nits hatched, recommends gumming cells 
of dark cloth or linen upon a man’s back for the purpose of raising lice. He illustrates the 
method by photographs, but records no observations made with the aid of it. It would 
be difficult to imagine a more cumbersome and unpractical method of raising lice. 
