INSECTS AND HUMAN 

 WELFARE 



AN ACCOUNT OF THE MORE IMPORTANT RELATIONS 



OF INSECTS TO THE HEALTH OF MAN, TO 



AGRICULTURE, AND TO FORESTRY 



BY 



CHARLES THOMAS BRUES 



ASSISTANT PROFESSOR OF ECONOMIC ENTOMOLOGY, BUSSEY INSTITUTION 



HARVARD UNIVERSITY 



CAMBRIDGE 

 HARVARD UNIVERSITY PRESS 



LONDON: HUMPHREY MILFORD 



OXFORD UNIVERSITY PRESS 



1920 



