90 LICE AND THEIR MENACE TO MAN 



four hours previously. In the third hour P.H. had been 

 much bitten on the abdomen and flanks. Most of the 

 lice were near the original site, a few only outside the 

 pyjamas. S.H. had not felt them. In the morning 

 S.H. said he had slept fairly well and had not been bitten 

 much. He felt the first bite about six hours after the 

 commencement. P.H. had not slept and had been 

 bitten all over. In the seventeenth hour after the 

 commencement the lice were collected, with the following 

 result : 



188 = 94 per cent of the 200 lice were recovered. Of these, 

 147 = 78-7 per cent were on or about P H. ; 



41=21-2 per cent were on or about S.H. ; 



79 = 42-0 per cent were inside the pyjamas of P.H. ; 



10= 5-3 per cent were inside the pyjamas of S.H. 



Experiment 3. 



Temperatures of P.H. : 99-0-97-8. Skin normal. 

 Temperatures of S.H. : 98-4-98-2. Skin normal. 



The lice were released at 7.15 P.M., having been last 

 fed seven hours previously. They showed no inclina- 

 tion to scatter but began feeding at once. In the third 

 hour P.H. had a normal temperature, the rise to 99 

 being only temporary. Half the lice were in the original 

 position on P.H., who had also been bitten about the 

 body and on the legs. S.H. had not been bitten. In 

 the sixth hour P.H. was being much bitten, while S.H. 

 had felt none, though one or two were on the outside of 

 his pyjamas. He- was bitten for the first time very 

 shortly after this visit. In the sixteenth hour after 

 the commencement the lice were collected, with the 

 following result : 



159 = 80 per cent of the 200 lice were recovered. Of these, 

 128 = 80-5 per cent were on or about P.H. ; 



31 = 19-5 per cent were on or about S.H. ; 



65 = 40-9 per cent were inside the pyjamas of P.H. ; 



13= 8-2 per cent were inside the pyjamas of S.H. 



