JOHN TYNDALL, F.R.S. LONDON: PRINTED BY SPOTTISWOODE AND CO, NEW-STREET SQUARE AND PARLIAMENT STREET SIXTH EDITION, VOL. 1. LONDON: LONGMANS, GREEN, AND CO. 1879. All rights reserved. PREFACE TO THE EDITOR OF THE TERM "INTERNAL-COMBUSTION ENGINE." In the most elementary service. Certainly there.