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 



t 



ASSISTANT PROFESSOR OF ECONOMIC ENTOMOLOGY, BUSSEY INSTITUTION 

 HARVARD UNIVERSITY 



CAMBRIDGE 

 HARVARD UNIVERSITY PRESS 



LONDON: HUMPHREY MILFORD 



OXFORD UNIVERSITY PRESS 



1920 



