CONTENTS. 



PACK 



PREFACE vii 



CHAPTER I. 



1. 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 



CKAPTEE II. 



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

 striated muscle-fibres; 3.' Connection of miiscles 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 IT. 



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

 contraction ; the myograph ; 3. Determination of electric 



