CAMBRIDGE UNIVERSITY PRESS 
CAMBRIDGE AGRICULTURAL MONOGRAPHS 
General Editors: T. B. WOOD, M.A., and 
E. J. RUSSELL, D.Sc. 
Inorganic Plant Poisons and Stimulants. By WINIFRED 
E. BRENCHLEY, D.Sc., F.L.S., Fellow of University College, London. 
With 19 illustrations. Royal 8vo. 53 net. 
Plants Poisonous to Live Stock. By HAROLD C. LONG, 
B.Sc. (Edin.), of the Board of Agriculture and Fisheries. Royal 8vo. 
CAMBRIDGE FARM INSTITUTE SERIES 
General Editors: Professor T. B. WOOD, M.A., and 
E. J. RUSSELL, D.Sc. 
The volumes of this series are intended to meet the needs of the many 
Farm Institutes already in existence or about to be formed. They are 
intended for the average student whose object is to farm, rather than for the 
exceptional man who wishes to become an agricultural expert. 
Now ready 
Farm Accounts. By C. S. ORWIN, Hon. M.A. 35 net. 
A Student's Book on Soils and Manures. By E. J. 
RUSSELL, D.Sc. . 33 6d net. 
Fungoid and Insect Pests of the Farm. By F. R. 
PETHERBRIDGE, M.A. With 54 illustrations. 43 net. 
UNIVERSITY OF CAMBRIDGE SCHOOL OF 
FORESTRY BULLETINS 
The Production and Utilisation of Pine Timber in 
Great Britain. Part I. Production. By E. R. BURDON, M.A., 
Investigator in Timber, and A. P. LONG, B.A., Assistant Investigator. 
No. i. Sample Plots of Scots Pine at Woburn. Demy 8vo. Paper 
covers, is 6d net. (Bulletin, No. i.) 
No. 2. Sample Plot of Scots Pine at King's Lynn. Demy 8vo. 
Paper covers, gd net. (Bulletin, No. 2.) 
THE JOURNAL OF AGRICULTURAL SCIENCE 
Edited by 
R. H. BIFFEN, M.A., F.R.S., A. D. HALL, M.A., F.R.S., 
E. J. RUSSELL, D.Sc., and T. B. WOOD, M.A. 
Price per volume, consisting of four parts, 153 net in paper covers, i8s 6d 
net bound in buckram; to subscribers, 153 net per volume, post free, payable 
in advance. The price of each part sold separately is 53 net. 
Cambridge University Press 
Fetter Lane, London: C. F. Clay, Manager 
i [p. T. o. 
