REPORT OF THE MALARIA EXPEDITION. 
47 
(7.) Towards the end of our stay in Freetown, one of us was attacked with fever : H. 
pracQX being at once found in his blood. From the first there was no rigor. The fever was 
continuous, but disappeared (together with the parasites) on the fifth day, as the result of treatment 
with quinine. The drug was continued for six weeks, and no relapse has occurred. 
(8.) Distribution of Anopheles costalis. — It is always difficult, without elaborate study of 
perfect specimens, to come to sound conclusions respecting the species of gnats. So far, however, 
as we could judge from specimens obtained from various parts of the West Coast, Anopheles costalis 
appears to have a wide distribution there. See, for instance, Strachan [27] and Fielding-Ould 
{^Addendum //.]. We may even conjecture — pending more certain information - that it is the 
principal agent of the deadly West Coast fever, 
(9.) Use of the microscope for clinical purposes.— We beg earnestly to recommend that 
Laveran's discovery, which has now been made for twenty years, be used in medical practice in 
malarious localities. The microscope is called for, not only for diagnosis and treatment, but in 
order to obtain exact information regarding the nature of the various fevers prevalent in warm 
countries-- fevers which often cannot be differentiated by the symptoms alone. For example, we 
do not yet know the nature of black-water fever — a point which would probably have been 
decided long ago if medical men had more generally adopted microscopical methods in their 
practice. 
(10.) In conclusion, it should be strongly emphasized that many substances which have 
not the power actually of killing Anopheles larvje may yet be capable of rendering depressions in 
the ground uninhabitable for them for long periods. Common salt may be effective ; but the 
range of substances for experiment in this connection is very large. It is to be hoped that such 
experiments will soon be made. 
FINIS, 
