Reproduced by courtesy of Mr. John Murray from Hallibur ton's" Handbook of Physiology." 



INFLUENCE OF FATIGUE ON THE CONTRACTION OF A MUSCLE 



The muscle is made to write a series of curves,P being the point of stimulation; the lower separate wavy line is the time-tracing, the 

 waves indicating hundredths of a second. The point is this: For a time the contractions improve, becoming more and more vigorous, 

 with higher and higher steep curves. But by and by the contractions get less and less vigorous; they take longer and longer; the curves 

 get flatter and flatter. Finally the muscle ceases to contract at all. 



