Note: Project Gutenberg also has an HTML version of this file which includes the original illustrations. See 65359-h.htm or 65359-h.zip: (http://www.gutenberg.org/files/65359/65359-h/65359-h.htm) or (http://www.gutenberg.org/files/65359/65359-h.zip) Images of the original pages are available through Internet Archive. See https://archive.org/details/jamesclerkmaxwel00glaziala Transcriber’s note: Text enclosed by underscores is in italics (_italics_). Superscripts that cannot be represented directly are enclosed by curly brackets immediately after a caret character (example: n^{th}). Some characters might not display properly in this UTF-8 text file (e.g., empty squares). If so, the reader should consult the html version or the original page images noted above. [Illustration: (cover)] _The Century Science Series_ Edited by Sir Henry E. Roscoe, D.C.L., LL.D., F.R.S. JAMES CLERK MAXWELL AND MODERN PHYSICS * * * * * * The Century Science Series. EDITED BY SIR HENRY E. ROSCOE, D.C.L., F.R.S., M.P. John Dalton and the Rise of Modern Chemistry. By Sir HENRY E. ROSCOE, F.R.S. Major Rennell, F.R.S., and the Rise of English Geography. By CLEMENTS R. MARKHAM, C.B., F.R.S., President of the Royal Geographical Society. Justus von Liebig: his Life and Work (1803–1873). By W. A. SHENSTONE, F.I.C., Lecturer on Chemistry in Clifton College. The Herschels and Modern Astronomy. By AGNES M. CLERKE, Author of “A Popular History of Astronomy during the 19th Century,” &c. Charles Lyell and Modern Geology. By Rev. Professor T. G. BONNEY, F.R.S. James Clerk Maxwell and Modern Physics. By R. T. GLAZEBROOK, F.R.S., Fellow of Trinity College, Cambridge. _In Preparation._ Michael Faraday: his Life and Work. By Professor SILVANUS P. THOMPSON, F.R.S. Humphry Davy. By T. E. THORPE, F.R.S., Principal Chemist of the Government Laboratories. Pasteur: his Life and Work. By M. ARMAND RUFFER, M.D., Director of the British Institute of Preventive Medicine. Charles Darwin and the Origin of Species. By EDWARD B. POULTON, M.A., F.R.S., Hope Professor of Zoology in the University of Oxford. Hermann von Helmholtz. By A. W. RÜCKER, F.R.S., Professor of Physics in the Royal College of Science, London. CASSELL & COMPANY, LIMITED, _London_; _Paris_ & _Melbourne_. * * * * * * [Illustration: J. Clerk Maxwell (_From a Photograph of the Picture by G. Lowes Dickinson, Esq., in the Hall of Trinity College, Cambridge._)] The Century Science Series JAMES CLERK MAXWELL AND MODERN PHYSICS by R. T. GLAZEBROOK, F.R.S. Fellow of Trinity College, Cambridge University Lecturer in Mathematics, and Assistant Director of the Cavendish Laboratory