Why, When, and How 



BY 



CLARENCE M. WEED, D. Sc. 



Professor of Zoology and Entomology, iVezu Hampsliire 

 College of Agricnltnre and the MecJianic Arts 



ILLUSTRATED 



3^nurth Sbtttmt— ISrhtsrS. Urhirtttrit anJj (Srratlg SttlargpJi 



NEW YORK 

 ORANGE JUDD COMPANY 

 1903 



