Transcriber’s notes: In this plain text transcription, italic text is denoted by _underscores_ and subscripted characters are surrounded by curly brackets preceded by an underscore, e.g. H_{12} The text of the book has largely been preserved in its original form. However, some spelling errors have been corrected and some missing punctuation items inserted (hyphen, space, parenthesis, quotation mark). Inconsistent spellings have not been changed. A list of spelling errors and inconsistencies has been appended at the end of the book. Missing footnote markers on pages 96 and 136 have been inserted at what seemed to be likely locations. The cover image of the book was created by the transcriber and is placed in the public domain. YALE UNIVERSITY MRS. HEPSA ELY SILLIMAN MEMORIAL LECTURES IRRITABILITY 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._ EXPERIMENTAL AND THEORETICAL APPLICATION OF THERMODYNAMICS TO CHEMISTRY. _By_ WALTHER NERNST, _Professor and Director of the Institute of Physical Chemistry in the University of Berlin_. _Price $1.25 net; postage 10 cents extra._ 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 25 cents extra._ THEORIES OF SOLUTION. _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 14 cents extra._ IRRITABILITY, A PHYSIOLOGICAL ANALYSIS OF THE GENERAL EFFECT OF STIMULI IN LIVING SUBSTANCE. _By_ MAX VERWORN, M.D., PH.D., _Professor at Bonn Physiological Institute_. _Price $3.50 net; postage 20 cents extra._ IRRITABILITY A PHYSIOLOGICAL ANALYSIS OF THE GENERAL EFFECT OF STIMULI IN LIVING SUBSTANCE BY MAX VERWORN, M.D., PH.D. _Professor at Bonn Physiological Institute_ WITH DIAGRAMS AND ILLUSTRATIONS [Illustration]