MICRO-ORGANISMS IN VARIOUS DISEASES. 213 



(f) Disinfection: Only necessary to destroy all mos- 



quitoes in sick-room andihouse. Sulphur 

 or pyrethrum two pounds to every one thoiT 

 sand cubic feet of space, exposure two 

 hours. 



(g) Prophylaxis: Protect sick from bites of mos- 



quitoes; screen houses, use mosquito nets, 

 and destroy mosquitoes in house by burn- 

 ing sulphur or pyrethrum; in yellow fever 

 zones, the breeding places of mosquitoes 

 should be removed or drained; persons 

 while out, should protect themselves from 

 bites. 



