72 



HUMAN PHYSIOLOGY 



FIG. 16. Analysis of tetanus. Experiment made upon the gastroc- 

 nemius muscle of a frog to show that by increasing the rate of stimu- 

 lation the contractions, at first separate (1), fuse more and more through 

 a series of incomplete tetani (2, 3, 4) into a complete tetanus (5) in f 

 which there is no indication, so far as the record goes, of a separate 

 effect for each stimulus. (Howell.) 



