INTRODUCTION TO REVISED BULLETIN. 



The exhaustion of the large edition of the " Weeds of Ontario" 

 prepared by Professor Harrison in 1899 called for the publication of 

 a new edition. On account of the increasing demand for information 

 regarding weed-seeds, it was deemed advisable to incorporate into this 

 revised bulletin some information regarding the identification of the 

 <;ommon weed-seed impurities which are found in commercial clover 

 a,nd timothy seed. A few additional weeds are described, and the 

 methods of eradication are in many cases given in greater detail. The 

 drawings of the weeds on pages 87 to 89 and of the weed seeds on pages 

 7 to 13 were made by Mr. John Buchanan, B.S.A. ; and much assistance 

 was given by Mr. T. D. Jarvis, B.S.A., Fellow in Biology at the O.A.C. 



Wm. Lochhead. 



