ENTOMOLOGY 



WITH SPECIAL REFERENCE TO 



ITS BIOLOGICAL AND ECONOMIC ASPECTS 



BY 



JUSTUS WATSON FOLSOM, Sc.D. (HARVARD) 



INSTRUCTOR IN ENTOMOLOGY AT THE UNIVERSITY OF ILLINOIS 



fftve flMates (ne Colored) 

 anfc 300 



PHILADELPHIA : 

 P. BLAKISTON'S SON & CO. 



1012 WALNUT STREET 

 1906 



