MIGRATION OF BODY-LICE 91 



SERIES B. In which the Primary Host was 

 febrile, the Secondary Host afebrile. 



Experiment 4. 



Temperatures of P.H. : 99-8, 100-2, 99-8, 99-0. 



Skin dry throughout. 

 Temperatures of S.H. : 98-2-97-0. Skin normal. 



The lice were released at 8 P.M., having been last 

 fed six hours previously. They showed no inclination 

 to scatter before feeding, which the majority commenced 

 to do at once. In the third hour none were in the 

 original position. A large number were on the blankets 

 and outside the pyjamas of P.H. Some had already 

 bitten S.H. In the morning S.H. complained of being 

 much bitten, especially inside the thighs. In the 

 sixteenth hour after the commencement the lice were 

 collected, with the following result : 



167 = 83-5 per cent of the 200 lice were recovered. Of these, 

 90 = 54 per cent were on or about P.H. ; 

 77 = 46 per cent were on or about S.H. ; 

 29 = 17-3 per cent were inside the pyjamas of P.H. ; 

 16= 9-6 per cent were inside the pyjamas of S.H. 



Experiment 5. 



Temperatures of P.H. : 101-4, 100-4, 99-8, 98-8. 



Skin dry throughout. 

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



The lice were released at 9.30 P.M., having been last 

 fed six hours previously. They showed no inclination 

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

 P.H. had been much bitten on the body and legs. S.H. 

 had not felt them at the beginning of the third hour 

 but was bitten before its close. In the fifth hour S.H. 

 said he had been much bitten on the abdomen and legs, 

 and several lice were on the outside of his pyjamas. 

 There were none in the original site on P.H. In the 

 seventh hour S.H. was being much bitten on the abdomen, 



