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Cover.
 
CAMBRIDGE AGRICULTURAL MONOGRAPHS
INORGANIC PLANT POISONS
AND STIMULANTS
 
CAMBRIDGE UNIVERSITY PRESS
C. F. CLAY, Manager
London: FETTER LANE, E.C.
Edinburgh: 100 PRINCES STREET
Colophon.
London: H. K. LEWIS, 136 GOWER STREET, W.C.
London: WILLIAM WESLEY AND SON, 28 ESSEX STREET, STRAND
New York: G. P. PUTNAM’S SONS
Bombay and Calcutta: MACMILLAN AND CO., Ltd.
Toronto: J. M. DENT AND SONS, Ltd.
Tokyo: THE MARUZEN-KABUSHIKI-KAISHA
All rights reserved
 
 INORGANIC PLANT POISONS
AND STIMULANTS
BY

WINIFRED E. BRENCHLEY, D.Sc., F.L.S.
Fellow of University College, London
(Rothamsted Experimental Station)
Cambridge:
at the University Press
1914
 
Cambridge:
PRINTED BY JOHN CLAY, M.A.
AT THE UNIVERSITY PRESS
 
PREFACE
During the last century great and widespread changes have beenmade in agricultural practice—changes largely associated withthe increase in the use of artificial fertilisers as supplements to thebulky organic manures which had hitherto been used. The value ofcertain chemical compounds as artificial manures is fully recognised, yetmany attempts are being made to prove the value of other substancesfor the same purpose, with a view to increase in efficiency and decreasein cost. The interest in the matter is naturally great, and agriculturists,botanists and chemists have all approached the question from theirdifferent standpoints. In the following pages an attempt is made tocorrelate the work that has been done on a few inorganic substanceswhich gave promise of proving useful in agricultural practice. Muchof the evidence put forward by different workers is conflicting, and it isclear that no definite conclusions can yet be reached. Nevertheless,examination of the evidence justifies the hope that results of practicalvalue will yet be obtained, and it is hoped that the analysis andcoordination of the available data put forward in this book will aid inclearing the ground for those investigators who are following up theproblem from both the academic and the practical standpoints.
W. E. B.
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