MOSQUITOES AND YELLOW FEVER 127 



ding- was added, some of it purposely soiled with the 

 bloody stools of a fatal case of yellow fever. Two of 

 them occupied beds from December 21st to January 

 10th, every nig-ht, wearing the very garments worn by 

 yellow-fever patients throug-hout their entire attacks, 



Fig. 31. — Strgomyia fdsciata, adult male ; enlarged. (Original.) 



making use exclusively of their much-soiled pillowslips, 

 sheets, and blankets. At the end of twenty-one nights 

 they went into quarantine (as had the former three) and 

 were released five days later. Two other non-immunes 

 occupied the same bods for twenty days more. The at- 

 tempt therefore which was made to infect this building 



