Zeer

Cholera is in the majority of cases a water-borne disease, due to water having become Cholera-contaminated [...] Water from zeers and goulahs should be looked upon with suspicion unless these are carefully watched and cleaned.

Before leaving Khartoum the bilge water in the various sections should be oiled by pouring petroleum on the surface [...] collections will harbour mosquito larvae, and attention should therefore be paid to the water-closet cisterns, zeers and tanks.