CONTENTS 



CHAPTER I 

 Introduction 



PAGE 



Science Defined 3 



Importance of Natural Laws 5 



How Other Sciences Have Contributed to Progress 



of Biology 6 



Biology Starts with Life 7 



Some Unsolved Biological Problems 8 



CHAPTER II 



The Laws of the Living Protoplasm 



Biogenesis 13 



Chemical Composition of Living Things .... i6 



Relation of Life to the Living Body l8 



The Size of Living Bodies 20 



The Age of Living Bodies 20 



The Biological Unit 21 



The Law of Growth 22 



The Law of Sensation 23 



Maintenance of Life 25 



Fate of Dead Bodies 26 



CHAPTER III 



The Biological Unit 



Historical 29 



Parts of Cell 30 



ix 



