RESEARCH IN BRITISH WEST AFRICA. 359d 
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 J 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 bungalows; (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. 
Lokoja.—Most of the remarks with regard to Zungeru apply equally well to 
Lokoja, but in addition to these the prevalence of Stegomyia fasciata 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 ground 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 Hgea, situated in a 
kurimi 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 this province as well as in others where the conditions are similar, for 
example, the Zungeru-Abuja Road and the Zaria~-Abuja Road, clearings ought 
to be made at all places where the main routes cross rivers or pass through 
kurimis. 
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 palpalis, 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, 
