FOREWORD 



During the last decade, there has been much interest manifested in regard 

 to plants injurious to live stock. Numerous contributions have been made along 

 this line, notably by Dr. Chesnut, formerly of the United States Department of 

 Agriculture, Drs. True and Wilcox and their co-workers also of Washington, 

 Dr. Schaffner of the Ohio State University, Dr. Jones of the Vermont Agri- 

 cultural Experiment Station, Dr. Kennedy of the Nevada Experiment Station, 

 Dr. Nelson of the Wyoming Station, Dr. Nelson of Washington, and Drs. 

 Peters and Bessey of Nebraska. Other station botanists have also contributed 

 to the same line of work. Much of the literature is scattered, however, hence 

 an effort has been made to bring together in the following pages the results 

 obtained. 



Much information on this line of investigation has also been obtained from 

 such works as Millspaugh's Medicinal Plants of North America, Dr. Johnson's 

 Manual of the Medical Botany of North America, Lloyd's Drugs and Medicines of 

 North America, Winslow's Veterinary Materia Medica and Therapeutics, Sayre's 

 Organic Materia Medica and Pharmacognosy, Fliickiger and Hanbury's Phar- 

 macographia, Greenish's Materia Medica, Ellingwood's Materia Medica, Thera- 

 peutics and Pharmacognosy, Pereira's Materia Medica, Luerssen's and Czapek's 

 publications and many others which give details in regard to the effects of 

 poisonous plants. 



Many persons may object to the great number of plants which are here 

 regarded as poisonous or described as such in this work. I have placed the 

 broadest interpretation on the subject and have, therefore, included all plants 

 that are injurious although many of these are not known to produce poisons, 

 some even being most useful economic plants and yet injurious to some people. 



It has been thought best to arrange the manual so as to consider the 

 plants in the same order as that given in Engler and Prantl's Die Pflanzen- 

 familien. 



The Schizomycetes were contributed by my colleague. Dr. R. E. Buchanan, 

 who has also favored me in many other ways. 



The parts concerning the blue-green algae and algae, taking up the higher 

 algae and their relation to the water slimes are given in their sequence under 

 the Schizophyceae and Euphyceae. 



The Eumycetes or true fungi are considered chiefly from the pathogenic 

 standpoint; while other fungi are referred to and briefly considered under 

 their respective groups. In regard to the higher fungi, such as the toadstools, 

 much valuable information may be obtained from the works of Dr. Farlow, 

 Prof. Peck and Prof. Atkinson. 



The so-called Blastomycetic fungi have been arranged under the group of 

 the imperfectly known forms. There are also brief characterizations of other 

 groups of the cryptogams such as lichens, mosses, ferns and their allies. 



