The Trustees of the British Museum were glad to avail 
themselves of the offer of the Liverpool School of Tropical 
Diseases to send out to Sierra Leone one of their Assistants with 
Major Ross, to make a special study, on the spot, of mosquitoes 
in connection with the objects of the expedition. They 
accordingly, on my recommendation, allowed Mr. E. L. Austen, 
Assistant in charge of the Dipterous Insects, three months' 
special leave of absence for the purpose. 
The expedition has resulted not only in the acquisition of 
much useful knowledge relative to the causes of malaria, but has 
also been the means of adding many interesting zoological 
specimens to the Museum. The National Collections have thus 
also been benefited, and the thanks of the Trustees are due to 
the Liverpool School of Tropical Diseases for their action in 
the matter. 
Mr. Austen's report has been printed by order of the Trustees 
with a view to its distribution among institutions and per un- 
interested in the subject. It may be of interest to state, in 
connection with the investigation of malarial diseases, that a 
large number of collections of mosquitoes from various parts of 
the world have been received in the Museum. These air being 
studied, and in due course a detailed report on them will be 
issued. 
E. RAY LANK EST ER, 
Director of the Natural History Departments, 
British Museum. 
British Museum (Natural History), 
Cromwell Road, London. S.W . 
4480 -50-12 99 Wt 22353 DiS 9 
