ANTIMOSQUITO BRIGADES 67 



hospital did not, liowever, pl■e^■ent malaria, and mos- 

 quitos infested both the houses and the hospital. 

 Indeed, it was found tliat niosquitos were more 

 abundant in the European quarter than in the 

 irregular, dirtier native quarters. This is now readily 

 explained by the fact that there were far less breeding 

 places in the Arab quarter, where there were none 

 of the garden drains, water-closets, and fountains 

 abundant in tiie European town. Dutton, in his 

 " Report of the Malaria Expedition to the Gambia 

 in 1902," has called attention to a similar condition in 

 Bathurst. 



Following Ross's directions, in 1901 two anti- 

 mosquito brigades were foruied, one, the " Drains 

 Brigade," composed of five natives and one European 

 in charge, whose duty it was to keep all drains clear. 

 The other, the " Petroleum Brigade," consisting of 

 four natives in charge of a European, w^as told off to 

 add petroleum to all collections of water which could 

 not be removed at once. In addition to forming 

 these brigades, the Company undertook extensive 

 drain-clearing operations and the filling in of a con- 

 siderable area of waste marshland with sand. 



The Methods of Mosauixo Exterminatiox — Work of the 



" Brigades " 



In company with Prince d'Arenberg, Sir John 

 Hardy, jNIr. William Johnston of Liverpool, ]M. Duelle- 

 nec, the Consulting Engineer, M. Doyen the Estate 

 Manager, and under the special guidance of M. Tillier, 

 chief of the Transport Service and a keen zoologist, 



