PRINCIPLES 



OF 



ECONOMIC ZOOLOGY 



PART I 



Field and Laboratory Guide 



BY 



L. S. DAUGHERTY. M.S., Ph. D. 



PROFESSOR OF ZOOLOGY, STATE NORMAL SCHOOL, KIRKSVILLE, MO. 



AND 



M. C. DAUGHERTY 



AUTHOR WITH JACKSON OF "AGRICULTURE THROWJH THE LABORATORY 

 AND SCHOOL GARDEN" 



PHILADELPHIA AND LONDON 



W. B. SAUNDERS COMPANY 



1912 



