54 MOSQUITOES 



lived in a malo.rious district ; a certain number, it ap- 

 peared, had not suffered from it in two or three years, 

 and all the others, that is to say, the har^e majority, had 

 suffered from it during the hist mahirial season, some of 

 them even in the winter. During the maharial season, 

 the health of the protected individuals was good, with the 

 exception of a few cases of bronchitis and a case of acute 

 gastroenteritis. None of these cases were treated with 

 quinine. The 104 persons, Avith three exceptions, had re- 

 mained free from malaria up to September 16th, the date 

 of the report. 



Another very striking experiment which during the 

 autumn of 1900 was mentioned in newspapers all over the 

 world, was that performed by Doctors Sambon and Low, 

 of the London School of Troi^ical Medicine, in the Ro- 

 man Campagna, during the late summer and early autumn 

 of 1900. They had constructed a comfortable little five- 

 roomed wooden house about three hours' drive from Ostia, 

 in one of the most malarious portions of the Campagna. 

 The house was tightly built and was thoroughly screened. 

 The experimenters lived in this house through the period 

 when malaria is most i^revalent. They took no quinine 

 and no health precautions beyond the fact that at sun- 

 down each day they entered the house and remained there 

 until daylight the next morning. Dr. Rees, of the London 

 School, visited them and occupied the house with them 

 for a portion of the time, and all three conducted labora- 

 tory work in one of the rooms, which was fully equipped 

 for such a purpose, and led a busy and contented life. 

 They visited the neighboring villages and investigated 



