A SERIES OF DETACHED ESSAYS, ADDRESSES, AND REVIEWS. BY JOHN TYNDALL, F.R.S. Printed By Spottiswoode AND CO. 1879. All rights reserved. PREFACE TO THE SIXTH EDITION. VOL. I. INORGANIC NATURE. I. THE LITTLE FLOWER-GIRL 11 II. A CLUSTER OF DAISIES 35 III. THE STEAM TURBINE. How a turbine works--The De Laval turbine--The Parsons turbine--Description of the lake.