G. H. F. Nuttall 
133 
24 eggs on blue felt, 
9 „ „ white silk tricot, 
6 „ „ smooth white silk (old handkerchief), 
4 ,, „ glossy black silk tricot (thin stocking), 
0 „ ,, black sateen. 
The last fabric on the list, the black sateen, has been used for some 
years in the laboratory for lice to oviposit upon : they lay readily upon 
it in the absence of other fabrics. 
Expt. 2. A similar number of lice were placed in a dish with seven 
pieces of fabric. After 48 hours they had laid 
15 eggs on blue felt, 
7 „ „ white silk tricot, 
5 „ „ thick shaggy blue cloth 
5 „ „ „ „ grey cloth 
5 ,, ,, thin brown cloth 
1 „ „ smooth blue cloth 
0 ,, ,, smooth white silk. 
I woollen, 
Expt. 3. Five females were placed in a dish, 12 cm. in diameter, 
containing 10 pieces of fabric, five of which were smooth and five more 
or less rough; the rough and smooth fabrics were arranged alternately. 
After 24 hours they had laid 
19 eggs on 
9 
0 
0 
0 
0 
0 
0 
.0 
0 
yy yy 
yy yy 
yy yy 
yy yy 
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white flannelette bandage 
thick bright green baize 
dark blue cloth, shaggy 
thin grey flannel 
cotton tricot, black stocking 
„ drill, thick and smooth 
,, loosely woven 
linen, coarse, unbleached 
,, finely woven, smooth 
silk, smooth white, thin 
\ 
- rough fabrics, 
- smooth fabrics. 
Nearly all the eggs were laid on the flannelette from which most 
fine fibres projected; next in order came the baize with many coarse 
fibres projecting; the shaggy blue cloth was the same used in Expt. 2, 
where it attracted but few lice; the lice missed this and the thin flannel, 
and no eggs were laid on the rest, five of these fabrics being smooth. 
