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COUNTRY LIFE EDUCATION
SERIES
Edited by Charles William Burkett, recently Director
of Experiment Station, Kansas State Agricultural
College; Editor of American Agriculturist
TTPES AND BREEDS OF FARM ANIMALS
By Charles S. Plumb, Ohio State University
PRINCIPLES OF BREEDING
By Eugene Davenport, University of Illinois
FUNGOUS DISEASES OF PLANTS
By Benjamin Minge Duggar, Cornell University
SOIL FERTILITY AND PERMANENT
AGRICULTURE
By Cyril G. Hopkins, University of Illinois
Other volumes in preparation
PRINCIPLES OF BREEDING
A TREATISE ON THREMMATOLOGY
OR
THE PRINCIPLES AND PRACTICES INVOLVED IN THE
ECONOMIC IMPROVEMENT OF DOMESTICATED ANIMALS AND PLANTS
BY
E. DAVENPORT, M.AGR, LL.D.
PROFESSOR OF THREMMATOLOGY IN THE UNIVERSITY OF ILLINOIS
DEAN OF THE COLLEGE OF AGRICULTURE
DIRECTOR OF THE AGRICULTURAL EXPERIMENT STATION
WITH APPENDIX
BY
H. L. RIETZ, PH.D.
ASSISTANT PROFESSOR OF MATHEMATICS IN THE UNIVERSITY OF ILLINOIS
GIN-N.& COMPANY
BOSTON. NEW YORK • CHICAGO • LONDON
ENTERED AT STATIONERS' HALL
COPYRIGHT, 1907
BY EUGENE DAVENPORT
ALL RIGHTS RESERVED
710.10
GINN & COMPANY. PROPRIETORS • BOSTON • U.S.A.
PREFACE
Two classes of people have been in mind in the preparation of this text, viz. the student of agriculture in the college and experiment station and the practical breeder upon the farm. Both need to know a…