CONTENTS. 



TAGR 



PREFACE vii 



CHAPTER I. 



L Introduction : Motion and sensation as animal charac- 

 teristics ; 2. Movement in plants; 3. Molecular motion; 

 4. Simplicity of the lowest organisms ; 5. Protoplasmic 

 motion and amoeboid motion; 6. Elementary organisms 

 and gradual differentiation of the tissues; 7. Ciliary 

 motion . 1 



CHAPTER II. 



1. Muscles, their form and structure; 2. Minute structure of 

 striated muscle-fibres ; 3. Connection of muscles and 

 bones ; 4. Bones and bone-sockets ; 5. The law of elasticity : 

 6. The elasticity of the muscles 12 



CHAPTER III. 



1. Irritability of muscle; 2. Contraction and tetanus; 3. 

 Height of elevation and performance of work ; 4. Internal 

 work during tetanus ; 5. Generation of heat and muscle- 

 tone : 6. Alteration in form during contraction ... 28 



CHAPTER IV. 



1. Alteration in elasticity during contraction; 2. Duration of 

 contraction; the myograpb ; 3. Determination of electric 



