xyi CONTENTS 



III 



THE CHANGE IN FORM 



Page 



VOLUME OF CONTRACTING MUSCLE 331 



THE SINGLE CONTRACTION OR TWITCH 332 



Muscle curve Duration of the several periods Exci- 

 tation wave Contraction wave Relation of strength 

 of stimulus to form of contraction wave Influence of 

 load on height of contraction Influence of temperature 

 on form of contraction Muscle warmer Influence of 

 veratrine on form of contraction. 



TETANUS 346 



Superposition of two contractions Superposition in teta- 

 nus Relation of shortening in a single contraction to 

 shortening in tetanus. 



THE ISOMETRIC METHOD . 349 



Graduation of isometric spring Heavy muscle lever 

 Isometric contraction. 



CONTRACTION OF HUMAN MUSCLE 353 



Simple contraction or twitch Ergograph Isometric 

 contraction Artificial tetanus Natural tetanus. 



SMOOTH MUSCLE 356 



Spontaneous contractions Simple contraction Tetanus. 



THE WORK DONE 358 



Influence of load on work done Absolute force of mus- 

 cleTotal work done ; the work adder Total work 

 done estimated by muscle curve Time relations of 

 developing energy. 



ELASTICITY AND EXTENSIBILITY 363 



Elasticity and extensibility of a metal spring Of a rubber 

 band Of skeletal muscle Extensibility increased in 

 tetanus. 



FATIGUE . . 366 



Skeletal muscle of frog Human skeletal muscle. 



