92 LICE AND THEIR MENACE TO MAN 



back, and legs. In the fifteenth hour after the com- 

 mencement the lice were collected, with the following 

 result : 



179 = 89-5 per cent of the 200 lice were recovered. Of these, 

 101=56-4 per cent were on or about P.H. ; 

 78 = 43-5 per cent were on or about S.H. ; 

 14=: 7-8 per cent were inside the pyjamas of P.H. ; 

 33 = 18-4 per cent were inside the pyjamas of S.H. 



Experiment 6. 



Temperatures of P.H. : 103-4, 102-7, 100-4. Skin 



dry and burning for the first three hours, then 



moist with sweat. 

 Temperatures of S.H. : 98-8-98-0. Skin normal. 



The lice were released at 2.15 P.M., having been last 

 fed seven hours previously. An unusual activity was 

 noticed amongst them, but about two-thirds commenced 

 feeding. No scattering took place during ten minutes' 

 observation before the men were covered up. In the 

 third hour, when P.H. was examined, very great activity 

 was noticed amongst the lice, which were running round 

 and round with a rapidity which we had never previously 

 noticed in the insects. The majority were still about 

 P.H., but S.H. had been bitten within an hour of the 

 release of the lice. In the fourth hour P.H. said he 

 could feel them running all over him but they were not 

 biting. S.H. was being bitten on the abdomen and 

 legs. In the seventh hour P.H. said he had been bitten 

 once or twice only since the last visit but he could still 

 feel them running about much. S.H. was being much 

 bitten and could feel them walking about over him. 

 In the eighth hour after the commencement the lice 

 were collected, with the following result : 



179 = 89-5 per cent of the 200 lice were recovered. Of these, 

 93 = 51-9 per cent were on or about P.H. ; 

 86 = 48-0 per cent were on or about S.H. ; 

 52 = 29-0 per cent were inside the pyjamas of P.H. ; 

 26 = 14-5 per cent were inside the pyjamas of S.H. 



