WORK PERFORMED DURING A TWITCH 



In this way a series of vertical lines have been recorded which 

 give the heights of the several contractions. Now take a piece of 

 squared paper and mark off these contractions in series, say 1 cm. 

 apart, measuring each contraction from the short horizontal mark to 

 the apex. In this way a series of lines similar to those above o x in 

 fig. 54 will be recorded. Mark above each the weight with which the 

 muscle was loaded at that contraction. The experiment from which 



Fig. 54. — Work-diagram of a Gastrocnemius for Single Twitches. The 

 ordinates above x are heights of twitch j the rectangles below repre- 

 SENT the Amounts of Work. 



fig. 54 was drawn was carried out in this way. Distances measured 

 along o x represent loads. Lines drawn parallel to o v represent 

 heights of contraction, and in this experiment they are magnified 

 five-fold. Each cm. measured along o x from o represents 40 grams. 

 The work performed during one of the contractions, e.g. b d, is I u d 

 x 160 grm. mm., b d to be measured in mm. As o b represents the 



E 2 



