CONTENTS. 



CHAPTER I. 

 PROTOPLASM AND THE CELL. 



Protoplasmic Structure . . . . . . . . . .17 



The General Properties and Nature of Protoplasm . . . . .17 



Hypotheses as to the Origin of Life . . * ,. " . . . .18 



Protoplasm is not a Definite Chemical Substance ..... 20 



Cells . . . 21 



The Structure of Protoplasm 23 



Suppositions as to the Molecular Structure of Protoplasm ... 24 



The Chemical Composition of Protoplasm ...... 25 



Elements ... . . . . . . . .26 



Compounds ........... 26 



Protoplasmic Function . ....... 34 



Respiration .... ...... 34 



Nutrition . ....... 35 



Digestion . . . . . . . . . .36 



Assimilation . . . . . . . . . . .36 



Excretion . . ...... 37 



Irritability . ......... 37 



Movement . . . . . . . . . . -37 



Secretion ... ....... 41 



The Production of Energy . ...... 42 



Conductivity . ... . . 42 



Taxes . . ... . . 43 



Consciousness .... ...... 43 



Reproduction and Growth . . ...... 44 



Amitosis .... ....... 44 



Mitosis ............ 45 



Heredity and Adaptation ......... 47 



An Example of Relatively Simple Protoplasm: Ameba .... 47 



CHAPTER II. 



THE NERVOUS SYSTEM. 



The General Functions of the Nervous System ...... 53 



Features of the Neural Structure . . . . . . . .56 



The Chemical Composition of Nerve-Tissue . . . . . . .61 



The Blood-Supply of the Nervous System 62 



Functional Parts of the Nervous System ....... 63 



The Hemispheres . . ... . . . .63 



The Cerebral Cortex .... . ' . . . 68 



The Motor Areas of the Human Cerebrum 70 



