CONTENTS 



PAGE 



I. SCIENCE AND PRACTICE i 



II. UNIVERSITY TRAINING .... 6 



III. DARWIN'S THEORY . . . .12 



IV. DARWIN'S DISCOVERIES . . . .18 

 V. DARWIN'S THEORY UNSHAKEN . . .27 



VI. METCHNIKOFF AND TOLSTOI . . . .38 



VII. THE LAND OF AZURE BLUE . . . .46 



VI J I. FRESH-WATER JELLY-FISHES . . . .58 



IX. THE STORY OF THE COMMON EEL . . .65 



X. MODERN HORSES AND THEIR ANCESTORS . . 77 



XI. A RIVAL OF THE FABLED UPAS TREE . . 91 



XII. POISONS AND STINGS OF PLANTS AND ANIMALS . 100 



XIII. THE DRAGON: A FANCY OR A FACT . . 114 



XIV. OYSTERS 128 



XV. MATERNAL CARE AND MOLLUSCS . . .143 



XVI. THE HEART'S BEAT 147 



XVII. SLEEP ....... 155 



XVIII. THE UNIVERSAL STRUCTURE OF LIVING THINGS . 170 



XIX. PROTOPLASM, LIFE AND DEATH . . .180 



XX. CHEMISTRY AND PROTOPLASM . . .187 



XXI. THE SIMPLEST LIVING THINGS . . . 193 



XXII. TADPOLES AND FROGS .... 209 



XXIII. ABOUT THE STARS ..... 220 



XXIV. COMETS 227 



XXV. ABOUT CHOLERA ..... 237 



XXVI. SEA-BREEZES, MOUNTAIN AIR, AND OZONE . 251 



XXVII. OXYGEN GAS FOR ATHLETES AND OTHERS . . 258 



