PREFACE 
The primary reason for this publication is the long- 
felt need of a text-book to accompany the course on pois- 
onous plants which is given the students of the Ontario 
Veterinary College. This object has been kept constantly 
in mind. It has necessitated the preparation of a book at 
a price within the reach of every student, and yet one 
that contains in easily available form an up-to-date 
knowledge of our common poisonous plants, the charac- 
teristics by which they may be recognized, the symptoms 
produced by them and the remedial treatment required. 
It is hoped that the book will also prove useful to the 
veterinarian who is in practice, the farmer, the stockman 
and, to a more limited extent, the medical practitioner 
and the public generally. 
In arranging the work, a departure has been made from 
the usual practice. To facilitate the determination of the 
plant responsible in a given case of poisoning, the book 
has been divided into four sections. In the first three 
are included the plants that are mainly responsible for 
fatalities among animals. These are grouped on the basis 
of their source in the animal’s feed, whether found in hay 
(Section I), in pasture (Section II), or in concentrated 
feedstuffs (Section III). A word may be added regarding 
Section III, since so far as the authors are aware this is 
the first time that the importance of poisonous plant con- 
stituents in concentrated feedstuffs has been given recog- 
nition in a text-book. Micro-analytical methods have 
lately been extended to determine the presence in such 
feedstuffs of poisonous material that eludes the ordinary 
