Gr. H. F. Nuttall 
515 
it being subsequently found that a very much larger proportion batched 
when carried on the person. Experiments on nits therefore still require 
to be carried out. The exposures were timed by a stop-watch and the 
immersed insects were removed with a fine brush and quickly dried on 
filter paper. The method of testing vapours is described on p. 501. 
Ref. 
No. 
348 
349 
350 
351 
352 
353 
354 
355 
356 
357 
358 
359 
360 
361 
362 
363 
Insecticide used 
Result 
+=killedin '=minutes 
o=survived exposure of "=seconds 
im. =immobilized 
Benzine 
Carbolic acid, 4 % 
4 o/ 
4% 
2 % 
2 % 
Carbon bisulphide 
Ether 
Lysol, 2 % 
Petrol 
Petroleum 
Sabadilla vinegar 
Staveacre decoction 
Sublimate, 0'2 % in gly¬ 
cerine-water 
Sublimate, 0-2 % in table 
vinegar 
Terebene (pure) 
Vermijelli, 2 % 
Water (as control) 
White hellebore decoction 
Xylol 
4- 1' 
+ 5' 
O 14 
O 2' 
O 5 
O 14 
O V 
+ 
+ H 
by vapour 
' im., recovered in 4 hr, lively after 2 hrs 
and still moving 
im. in 3', recovered and lively after 14 hrs 
im. but recovered and lively after 14 hrs 
:j u 5J 
im. at once, remain clinging to hair 
+ l 
+ ■£' 
+ 3' by vapour 
+ 14' im. in 1', released hair and straightened legs out quickly 
+1' ,, Y „ „ ,j „ „ 
+ l' 
O Y released hair, but moving feebly after 47' 
O £' „ ,, „ fairly active after 48' 
+ 5' by vapour 
+ 5' 
O 3' lively after 1 \ hrs 
+ 2 ' 
O 14' im. in 1' 
O 1' im. but recovered in £ hr 
+ Y (perhaps feeble to start with) 
O 5' im. but moving 3 Y after removal from vapour 
-f 5' im. in 3J' and dead in 1J hrs 
O 1 Y arL d still moving 
O 1' active after 2' 
O Y 
O 15' began moving Y after removal from vapour 
O 6' active 11' after removal 
O 5' moved for 3^', alive but feeble after 1 hr 
+ 5, 
O 4' im. in 1' but lively again 1} hrs after removal 
+ 4' im. in 2' 
O 2' still moving 
O 4' im. in 24' but fairly lively after 1|- hrs 
O 5' active 20' after removal 
+ 5' 
+ 5' 
O 45' though some ceased moving in 1' 
O 60' one active, others torpid for a time 
O 5' lively after 1 hr 
O Y moved feebly after 37' 
O I' „ i, >, 48' 
+ 14' 
4- 2' struggled, im. in 2', released hair, dead 30' later 
4- 3' 
?? ii ii 
Of the insecticides tested benzine, carbon bisulphide, ether and xylol 
obviously killed pubis most rapidly. 
