YALE UNIVERSITY MRS. HEPSA ELY SILLIMAN MEMORIAL LECTURES PROBLEMS OF GENETICS SILLIMAN MEMORIAL LECTURES PUBLISHED BY YALE UNIVERSITY PRESS ELECTRICITY AND MATTER. _By_ JOSEPH JOHN THOMSON, D.SC., LL.D., PH.D., F.R.S., _Fellow of Trinity College, Cambridge, Cavendish Professor of Experimental Physics, Cambridge_. _Price $1.25 net; postage 10 cents extra._ THE INTEGRATIVE ACTION OF THE NERVOUS SYSTEM. _By_ CHARLES S. SHERRINGTON, D.SC., M.D., HON. LL.D., TOR., F.R.S., _Holt Professor of Physiology in the University of Liverpool_. _Price $3.50 net; postage 25 cents extra._ RADIOACTIVE TRANSFORMATIONS. _By_ ERNEST RUTHERFORD, D.SC., LL.D., F.R.S., _Macdonald Professor of Physics, McGill University_. _Price $3.50 net; postage 22 cents extra._ EXPERIMENTAL AND THEORETICAL APPLICATIONS OF THERMODYNAMICS TO CHEMISTRY. _By_ DR. WALTHER NERNST, _Professor and Director of the Institute of Physical Chemistry in the University of Berlin_. _Price $1.25 net; postage 10 cents extra._ THE PROBLEMS OF GENETICS. _By_ WILLIAM BATESON, M.A., F.R.S., _Director of the John Innes Horticultural Institution, Merton Park, Surrey, England_. _Price $4.00 net; postage 25 cents extra._ STELLAR MOTIONS. WITH SPECIAL REFERENCE TO MOTIONS DETERMINED BY MEANS OF THE SPECTROGRAPH. _By_ WILLIAM WALLACE CAMPBELL, SC.D., LL.D., _Director of the Lick Observatory, University of California_. _Price $4.00 net; postage 30 cents extra._ THEORIES OF SOLUTIONS. _By_ SVANTE AUGUST ARRHENIUS, PH.D., SC.D., M.D., _Director of the Physico-Chemical Department of the Nobel Institute, Stockholm, Sweden_. _Price $2.25 net; postage 15 cents extra._ IRRITABILITY. A PHYSIOLOGICAL ANALYSIS OF THE GENERAL EFFECT OF STIMULI IN LIVING SUBSTANCES. _By_ MAX VERWORN, _Professor at Bonn Physiological Institute_. _Price $3.50 net; postage 20 cents extra._ THE EVOLUTION OF MODERN MEDICINE. _By_ SIR WILLIAM OSLER, BART., M.D., LL.D., SC.D., _Regius Professor of Medicine, Oxford University_. _Price $3.00 net; postage 40 cents extra._ PROBLEMS OF GENETICS BY WILLIAM BATESON, M.A., F.R.S. DIRECTOR OF THE JOHN INNES HORTICULTURAL INSTITUTION, HON. FELLOW OF ST. JOHN'S COLLEGE, CAMBRIDGE, AND FORMERLY PROFESSOR OF BIOLOGY IN THE UNIVERSITY _WITH ILLUSTRATIONS_ [Illustration] NEW HAVEN: YALE UNIVERSITY PRESS LONDON: HUMPHREY MILFORD OXFORD UNIVERSITY PRESS MCMXIII Copyright, 1913 By YALE UNIVERSITY First printed August, 1913, 1000 copies