CAMBRIDGE PUBLIC HEALTH SERIES 



UNDER THE EDITORSHIP OF 

 G. S. Graham-Smith, M.D. and J. E. Purvis, M.A. 



University Lecturer in Hygiene and 

 Secretary to the Sub-Syndicate for 

 Tropical Medicine 



University Lecturer in Chemistry 

 and Physics in their application 

 to Hygiene and Preventive Medi- 

 cine, and Secretary to the State 

 Medicine Syndicate 



FLIES IN RELATION TO DISEASE 



BLOODSUCKING FLIES 



