vi Preface 
Further, there may frequently be doubt as to the identification of the 
plant suspected of causing poisoning; indeed, in some cases it is 
possible that the identification rests on the veterinary surgeon or 
the stockman thinking a certain plant is the cause. The most 
complete and systematic account of European poisonous plants is 
that of Cornevin (1887), and references to poisonous plants in the 
ordinary literature are heavily indebted to him. In so far as the 
toxic principles of the plants are concerned, however, his book is in 
many instances no longer reliable. 
The chemical formulae, quoted for the use of students and research 
workers, have been checked by consulting works by the following 
authors, the reference to the bibliography being given in brackets: 
Henry (128), Dunstan (76), Allen (4), Haas and Hill (114), Thorpe (240), 
Van Rijn (252), Robert (161), Esser (81), and Beilstein (16). 
Apart from the literature consulted I desire to acknowledge my 
great indebtedness to the Board of Agriculture and Fisheries for kind 
permission to make use of official records; to Mr F. W. Garnett, 
M.R.C.V.S., for kindly reading the proofs from the veterinary stand- 
point; to very many Experiment Stations, State Departments of 
Agriculture, and other authorities in Australasia, America and the 
Continent of Europe, for assistance given and literature sent; to 
Sir David Prain and members of the staff at Kew for much friendly 
advice, and aid in consulting the Kew library ; to Sir James Dobbie 
for permission to spend some time at the Government Laboratories 
to consult certain volumes; to Mr T. H. Middleton, C.B., Dr E. J. 
Russell, Professor W. Somerville, Sir Stewart Stockman, Professor 
T. B. Wood, and others, for information and many helpful suggestions ; 
to my friend Mr W. A. Whatmough, B.Sc. (Lond.), for many sugges- 
tions and kindly reading the proofs; and to my colleague Mr W. R. 
Black for invaluable help in preparing notes, checking data and reading 
proofs. To all these, and many others who are not mentioned by 
name, I tender my sincere thanks. 
For any shortcomings I crave the indulgence of my readers, only 
requesting that they be friendly enough to spare a moment to call 
my attention thereto. 
H. C. LONG. 
STTRBITON, 
October, 1916. 
