Ontario Department of Agriculture. 



ONTARIO AGRICULTURAL COLLEGE. 



BULLETIN 168. 



The Perennial Sow Thistle 



and Some Other Weed Pests of 1 908 



BY 



J. EATON HOWITT, M.S.A., Demonstrator in Betany. 



Printed by L. K CAMERON, Printer to the King's Most Excellent Majesty. 



Toronto, Ont., October, 1906. 



