Gr. H. F. Nuttall 
101 
especially used the three legs of one side, occasionally the third leg of 
the other side being used to right itself; after using let us say the three 
right legs for a while, these were replaced by the three left legs; in each 
case the foreleg on the side away from the hair waved about rapidly 
as if in search of something to grasp, whilst the insect steadily progressed. 
Of the legs grasping the hair, the first appeared to do most of the work, 
its movements recalling that of the human arm in the effort of climbing 
a rope. In this way, the louse climbed along the single hair, swinging 
from side to side as it alternately brought the left legs and then the right 
legs into play upon the hair. The following climbing records are those 
of different individuals that were tested within 24 hours of their having 
moulted. 
Records of the Rate at which Pediculus climbs Hair. 
(a) Capitis. (Lot 210.) 
Apparatus placed in a window. Time given in minutes and seconds. 
The distance travelled was 20 cm. All the insects had fed moderately 
and were removed shortly before from the person. Bright diffused 
light from the north. 
Temp. 
17-18° C. 
Stage 
Time 
No. of hairs 
Direction 
? 
V 25" 
2 
vertically upward 
? 
V 50" 
2 
99 99 
c? 
V 50" 
2 
99 r? 
c? 
V 50" 
1 
99 59 
¥ 
2' 4" 
1 
99 99 
d 
2' 20" 
2 
99 99 
i 
Id 
2' 25" 
1 
99 99 
J 
Id 
2' 46" 
1 
vertically downward 
Id 
2' 12" 
1 
angle of 45° upward 
1 
u 
3' 
1 
,, „ downward 
d 
3' 10" 
1 
99 99 99 
$ 
2' 42" 
1 
„ „ upward 
? 
r 32" 
2 
horizontally, away from light 
? 
2' 13" 
1 
99 99 99 
3rd st. L. 
2' 45" 
1 
vertically upward 
2nd st. L. 
3' 
1 
99 99 
1st st. L. 
8' 57" 
1 
,, „ (unfed; refused 
to climb when fed) 
1 The brackets denote records relating to the same individual. 
