Front matter

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

New Haven: Yale University Press London: Humphrey Milford Oxford University Press

MCMXIII

Copyright, 1913 By Yale University

First printed August, 1913, 1000 copies

THE SILLIMAN FOUNDATION

In the year 1883 a legacy of about eighty-five thousand dollars was left to the President and Fellows of Yale College in the city of New Haven, to be held in trust, as a gift from her children, in memory of their beloved and honored mother, Mrs. Hepsa Ely Silliman.

On this foundation Yale College was requested and directed to establish an annual course of lectures designed to illustrate the presence and providence, the wisdom and goodness of God, as manifested in the natural and moral world. These were to be designated as the Mrs. Hepsa Ely Silliman Memorial Lectures. It was the belief of the testator that any orderly presentation of the facts of nature or history contributed to the end of this foundation more effectively than any attempt to emphasize the elements of doctrine or of creed; and he therefore provided that lectures on dogmatic or polemical theology should be excluded from the scope of this foundation, and that the subjects should be selected rather from the domains of natural science and history, giving special prominence to astronomy, chemistry, geology, and anatomy.

It was further directed that each annual course should be made the basis of a volume to form part of a series constituting a memorial to Mrs. Silliman. The memorial fund came into the possession of the Corporation of Yale University in the year 1901; and the present volume constitutes the fifth of the series of memorial lectures.