HISTORY AND BIBLIOGRAPHY 825 



able to recognize any of the common weeds of that state. Another 

 special bulletin is the Ohio weed manual by Prof. Selby. This 

 excellent manual describes and gives the distribution of Ohio 

 weeds as well as hints on extermination of the common weeds of 

 that state. The discussions on- weeds by Crozier, Dewey and other 

 botanists of the United States Department of Agriculture, are 

 most helpful as regards the more common weeds of eastern North 

 America. 



The most recent extensive account of weeds in Canada is a 

 book by Clark and Fletcher. This work describes many families 

 of weeds, one or more species of each genus being illustrated with 

 colored figures. In addition many weed seeds are described. Some 

 of the headings are as follows : Losses Due to "Weeds, How Weeds 

 Spread, Weed Seeds in the Soil, Commercial Seeds and Feeding 

 Stuffs. This book will enable one to recognize the more or les.= 

 common weeds found in Canada. It has passed through two edi- 

 tions, the first having been published in 1906 and the second in 

 1909. 



The most recent English publication is a book by H. C. Long 

 and John Percival, "Common Weeds of the Farm and Garden." 

 This book of 451 pages contains many half tone illustrations and 

 figures of weeds that are common to the British Isles, treated under 

 the following heads: Weeds of Rivers and Ditches also Drives, 

 Worst Weeds, Weeds and the Improvement of Grass Land, Weeds 

 of the Arable Land, What Weeds Are and How They Affect our 

 Crops and Stock, Parasite Plants and Poisonous Plants, Principles 

 of Seed Testing, besides a Bibliography of 5 pages referring to 

 the more important papers published in Europe, England and 

 Canada. In addition to this English publication there have been 

 published by M. G. Smith "One Hundred Yorkshire Weeds," and 

 "A Contribution to our Knowledge of the Influence of Manures on 

 the Botanical Composition of the Herbage of Permanent Grass- 

 Land." 



Many weeds have received special attention in the United 

 States. Of these, perhaps the Russian thistle, some 20 years ago, 

 received more attention for a few years than any other weed. The 

 earliest account of this weed was made by J. N. Rose in 1891, fol- 

 lowed by a more extensive bulletin on the same weed by Dewey in 

 1893, and another paper by the same author in 1894. Papers were 

 also published by Bessey of Nebraska, Goff of Wisconsin, Pammel 

 and Wilson of Iowa, Hays of Minnesota, BoUey of North Dakota, 



