W. r'VAM 
Fig. 9. —Pools left by the falling Blue Nile, opposite the Eastern Section of Khartoum 
The presence of fish in these pools, as a rule, prevented mosquitoes breeding out in them 
Fig. 10.—Pools left by the falling Blue Nile in the Sandbank. East of the 
British Barracks. Khartoum 
Auophi'lincs bred out in some of these pools which did not contain fish 
E 
