DARWIN, AND AFTER DARWIN
III
POST-DARWINIAN QUESTIONS
ISOLATION AND PHYSIOLOGICAL SELECTION
BY THE SAME AUTHOR.
DARWIN, AND AFTER DARWIN. An Exposition of theDarwinian Theory and a Discussion of Post-DarwinianQuestions.
1. The Darwinian Theory. With portrait of Darwin.460 pages. 125 illustrations. Cloth, $2.00.
2. Post-Darwinian Questions. Edited by Prof. C.Lloyd Morgan. With portrait of G. J. Romanes.338 pages. Cloth, $1.50.
3. Post-Darwinian Questions. Isolation and PhysiologicalSelection. Edited by Prof. C. LloydMorgan. With portrait of Mr. J. T. Gulick. 181pages. Cloth, $1.00.
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DARWIN, AND AFTER DARWIN
AN EXPOSITION OF THE DARWINIAN THEORY
AND A DISCUSSION OF
POST-DARWINIAN QUESTIONS
BY THE LATE
GEORGE JOHN ROMANES, M.A., LL.D., F.R.S.
Honorary Fellow of Gonville and Caius College, Cambridge
III
POST-DARWINIAN QUESTIONS
ISOLATION
AND PHYSIOLOGICAL SELECTION
Chicago
THE OPEN COURT PUBLISHING COMPANY
1906
CHAPTER 1. COPYRIGHTED BY
THE OPEN COURT PUBLISHING CO.
1897.
The Lakeside Press
R. R. DONNELLEY & SONS CO., CHICAGO
PREFACE
Of the six chapters which constitute this concludingvolume of G. J. Romanes' Darwin, and afterDarwin, three, the first two and the last, were intype at the time of his death. I have not consideredmyself at liberty to make any alterations of momentin these chapters. For the selection and arrangementof all that is contained in the other threechapters I am wholly responsible.
Two long controversial Appendices have beenomitted. Those marked A and B remain in accordancewith the author's expressed injunctions. Ina third, marked C, a few passages from the author'snote-books or MSS. have been printed.
The portrait of the Rev. J. Gulick, which forms thefrontispiece, was prepared for this volume before theauthor's death. Mr. Gulick's chief contributions tothe theory of physiological selection are to be foundin the Linnean Society's Journal (Zoology, vols. xx[Pg vi]and xxiii), and in four letters to Nature (vol. xli.p. 536; vol. xlii. pp. 28 and 369; and vol. xliv.p. 29).
I have to thank Mr. Francis Galton, D.C.L., F.R.S.and Mr. F. Howard Collins for valuable assistancegenerously rendered for the sake of one whom allwho knew him held dear. For he was, if I mayecho the words of Huxley, "a friend endeared tome, as to so many others, by his kindly nature, andjustly valued by all his colleagues for his powersof investigation and his zeal for the advancement ofscience."
C. Lloyd Morgan.
Bristol,