THE WONDERS OF LIFE A POPULAR STUDY OF BIOLOGICAL PHILOSOPHY BY ERNST HAECKEL (Ph.D., M.D., LL.D., Sc.D., and Professor at the University of Jena) AUTHOR OF "THE RIDDLE OP THE UNIVERSE" "THE HISTORY OF CREATION" "THE EVOLUTION OF MAN" ETC. TRANSLATED BY JOSEPH McCABE SUPPLEMENTARY VOLUME TO "THE RIDDLE OF THE UNIVERSE" [Illustration: LOGO] HARPER & BROTHERS PUBLISHERS NEW YORK AND LONDON 1905 Copyright, 1904, by HARPER & BROTHERS. _All rights reserved._ Published January, 1905. CONTENTS PART I.--METHODOLOGICAL SECTION: KNOWLEDGE OF LIFE PAGE PREFACE v CHAPTER I TRUTH 1 CHAPTER II LIFE 27 CHAPTER III MIRACLES 54 CHAPTER IV THE SCIENCE OF LIFE 77 CHAPTER V DEATH 97 PART II.--MORPHOLOGICAL SECTION: NATURE OF LIFE CHAPTER VI PLASM 121 CHAPTER VII UNITIES OF LIFE 147 CHAPTER VIII FORMS OF LIFE 170 CHAPTER IX MONERA 190 PART III.--PHYSIOLOGICAL SECTION: FUNCTIONS OF LIFE CHAPTER X NUTRITION 210 CHAPTER XI REPRODUCTION 239 CHAPTER XII MOVEMENT 258 CHAPTER XIII SENSATION 287 CHAPTER XIV MENTAL LIFE 315 PART IV.--GENEALOGICAL SECTION: HISTORY OF LIFE CHAPTER XV THE ORIGIN OF LIFE 336 CHAPTER XVI THE EVOLUTION OF LIFE 359 CHAPTER XVII THE VALUE OF LIFE 386 CHAPTER XVIII MORALITY 411 CHAPTER XIX DUALISM 433 CHAPTER XX MONISM 452 INDEX 475 PREFACE