THE JOURNAL OF 
AGRICULTURAL SCIENCE 
Edited by 
Professor R. H. BIFFEN, M.A., Cambridge, A. D. HALL, M.A., F.R.S., 
Rothamsted, and Professor T. B. WOOD, M.A., Cambridge. 
The Journal of Agricultural Science is issued in quarterly parts of about 
100 pages, with plates and figures, four parts constituting a volume. 
Volumes I and II now ready. In Four Parts, paper covers, 15s. net per 
volume. Bound in Buckram, 18s. 6c?. net per volume. 
The subscription price, payable in advance, is 15s. per volume (post free); 
single numbers 5s. net. Subscriptions may be sent to any Bookseller, or 
to Mr C. F. Clay, Manager, Cambridge University Press, Fetter Lane, 
London, E.C. 
A TREATISE ON PLAQUE 
Dealing with the Historical, Epidemiological, Clinical, 
Therapeutic and Preventive Aspects of the Disease 
by 
W. J. SIMPSON, M.D. Aberd., F.R.C.P. Lond., D.P.H. Camb. 
Professor of Hygiene, King’s College, London; Lecturer on Tropical Hygiene, London School of 
Tropical Medicine; formerly Health Officer, Calcutta; Medical Adviser to the Government 
of Cape Colony, during the outbreak of Plague in 1901; Commissioner for the Colonial 
Office to inquire into the causes of the continuance of Plague in Hong Kong. 
Royal 8vo. Buckram. Pp. xxiv + 466. With 6 maps 
and 34 illustrations. Price 16s. net. 
TICKS 
A Monograph of the Ixodoidea 
By GEORGE H. F. NUTTALL, M.D., Ph.D., Sc.D., F.R.S., CECIL 
WARBURTON, M.A., F.Z.S., W. F. COOPER, B.A., F.Z.S., F.L.S., 
and L. E. ROBINSON, A.R.C.Sc. (London) 
Now Ready. PART I. THE ARGA8IDAE. With 116 text 
Figures and 3 Plates. Royal 8vo. 5s. net 
This book will deal with the Classification, Structure and Biology of 
Ticks, the study of the group having occupied the authors for several years. 
Practically all that has been published on the subject has received adequate 
consideration. 
The book will be issued in about four parts, which will be complete in 
themselves but are designed to form a volume of about 500 pages when all 
the parts have been published. Each part will be issued in a stiff paper 
cover and will include a bibliography printed on one side of thin paper so 
that the references can be conveniently cut out and gummed on index cards. 
A complete bibliography, including all the publications cited in each part, 
will conclude the volume. 
CAMBRIDGE UNIVERSITY PRESS, FETTER LANE, LONDON 
C. F. CLAY, Manager 
