RESEARCH IN BRITISH WEST AFRICA. 355 



and this applies equally to the vessels which ply on the Niger. Further, in the 

 individual cabins one usually finds the same wash-stand arrangement as is used 

 on ocean-going steamers. Now this involves two separate receptacles for water, 

 and on three different occasions I have found mosquito larvae in these vessels. 

 It is difficult, if not almost impossible, when native servants are employed to ensure 

 that these will be kept empty when not in use, and as stated above, they may 

 thus be a source of danger. Consequently, to obviate this risk, vessels built for 

 use on such rivers ought to have a central water supply conveyed by pipes 

 from a mosquito-proof tank, and have also a system whereby the refuse water 

 could be carried off directly in a similar manner. It is impossible to insist too 

 strongly on the careful supervision of all water receptacles on launches and 

 steamers. 



With regard to individual localities, it is necessary to refer only to a limited 

 number, as the suggestions here made may be applied to others with similar 

 conditions. The following suggestions may be noted : — 



Zungeru. — (1) The free use of kerosene in the pools left by the smaller streams 

 during the dry season ; (2) the proper sloping and systematic inspection of 

 the gutters on the roofs of brmgalows ; (3) the removal of the residential 

 quarters over the Government offices in Ike Square ; (4) the necessity for an 

 extensive clearing all round the cantonment ; (5) the formation of a Government 

 segregation camp for infected horses. This should be situated as far from the 

 rivers as possible and in the centre of a large open clearing. 



Lolioja. — Most of the remarks with regard to Zungeru apply equally well to 

 Lokoja, but in addition to these the prevalence of Stegomyia fasciuta along the 

 river-bank area calls for special attention. The only feasible method of checking 

 this pest seems to be the formation of a masonry or concrete wall along the river 

 bank, more especially at those places where launches and steamers load and 

 unload. 



Baro. — Attention has already been directed to the necessity for filling up the 

 large "ju-ju " swamp, and clearing on the lines already started should be most 

 rigorously continued. 



Kateri. — The town of Kateri and others in similar situations should be 

 removed to the more open grormd and a clearing of several hundred yards made 

 around the watering places. 



Bassa. — The rest camps at Lafia and Aiyangba might with advantage be 

 removed further from the kurimis. Villages, such as Egga, situated in a 

 kiu-imi should be abandoned and others built in the open country. The European 

 quarters at Ankpa ought to be immediately transferred to higher ground and 

 separated from the thick bush by a large open clearing of several hundred yards. 

 In tins province as well as in others where the conditions are similar, for 

 example, the Zungeru-Abuja Road and the Zaria-Abuja Eoad, clearings ought 

 to be made at all places where the main routes cross rivers or pass through 

 lairimis. 



Sleeping Sickness Camps. — ^As already stated, a sleeping sickness camp has 

 been inaugurated near Zaria, but from the point of view of the distribution of 

 Glossina pialpalis, and in the event of its being necessary to establish another, 

 some region in the vicinity of Maiduguri or at any rate in the Chad river system 

 ought to be selected. 



