<yU J 



Z^^o 



A TEXT-BOOK 



AGRICULTURAL ZOO 



FEED. V. THEOBALD, M.A. (Cantab.), F.E.S. 



Foreign Member of the Association of Official Economii: Entomolo^ista, U.S.A. ; 



Zoologist to the S, E, Agricultural College, Wye ; 



Author of ' An Account of British Flies,' ' Insect Life,' ' The Parasitic 



Diseases of Poultry,' &o. 



WILLIAM BLACKWOOD AND SONS 

 EDINBURGH AND LONDON 



MDCOCXCIX 



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