REPORT OF THE MALARIA EXPEDITION. 
3 
We arrived in Freetown, Sierra Leone, on the loth August, 1899 ; and speedily 
succeeded in ascertaining that two species of gnats of the genus Anopheles found in Freetown are 
hospitable to the human Haemamoebidas [Section III.]. The rest of our time was spent chiefly in 
a study of the bionomics of these insects [Section IF.] ; and we left Freetown for England on the 
27th September, after seven weeks' stay in the colony. 
Our observations constitute the body of this report ; but before our departure from Sierra 
Leone we were joined by Dr. Fielding-Ould, who was despatched by the Committee of the 
School to continue our labours after our return. After we left. Dr. Fielding-Ould proceeded to 
Accra and Lagos ; and his observations are given separately in the Addenda to this report. 
We were also joined at Freetown by Dr. G. Van Neck from Belgium. Dr. Van Neck 
was unfortunately taken seriously ill shortly after our departure, and did not return until 
December. 
4. Terminology Employed. — As regards the Haemamoebidae, we adopt the morpho- 
logical terminology and taxonomic nomenclature already used by one of us in consultation witli 
Professor Herdman, F.R.S. [15]. These will be found, in the Discussions [paj-agraph 19] ; where 
we consider the terminology further, and also give a summary of the life-history and classification 
of the parasites. 
As there is no difference between gnats and mosquitoes — the latter term being merely one 
which is popularly employed for gnats in warm countries — and as this confusion tends to maintain 
erroneous notions regarding these insects, we propose to abandon tlie word moiquito and use in 
preference the old English equivalent gnat. 
The terms malaria and malarial fever are unsound, while paludism is inexact. We may 
therefore venture to suggest the appellations hamafncehiasis or gnat-fever for the disease which is 
the subject of this report. They will at least serve to popularise more correct notions of the 
malady than are implied in tlie word malaria. 
