CONTENTS 



CHAPTER PAGE 



I. THE BIOLOGY OF TO-MORROW 1 



II. THE GROWTH OF SCIENCE . . . . . . .10 



III. THE MICROSCOPE ' 19 



IV. THE HISTORY OF CELLS . 27 



V. FUNCTIONS OF A GREEN CELL . 34 



VI. TYPICAL ANIMAL CELL . . 42 



VII. THE RESTING AND DIVIDING CELL . . . . .53 



VIII. STRUCTURE OF HIGHER PLANTS 66 



IX. HUMAN TISSUES 73 



X. HUMAN TISSUES (Continued) . . . . . .83 



XL FOOD NUTRIENTS . . 91 



XII. THE TEETH AND THEIR CARE 107 



XIII. THE DIGESTIVE SYSTEM 114 



XIV. DIGESTION AND ABSORPTION 125 



XV. BLOOD AND ITS IMPORTANCE . . . . . . . 143 



XVI. CIRCULATORY SYSTEM . . 151 



XVII. LYMPHATIC SYSTEM . . . . " . . . .163 



XVIII. THE SKIN AND KIDNEYS . . . . . .170 



XIX. RESPIRATION 177 



XX. METABOLISM .187 



XXL DUCTLESS GLANDS .191 



XXII. THE NERVOUS SYSTEM 



XXIII. NERVOUS REACTIONS 



XXIV. MENTAL HYGIENE 



XXV. How LIFE BEGAN 



XXVI. ASEXUAL REPRODUCTION 



vii 



