362 THE OUTGO OF ENERGY - 



set free is sufficient to lift a load of 50 grams. 

 Turn the drum until the writing point of the 

 signal rests in the line made by the signal when 

 the muscle was stimulated. Let the drum be 

 stationary. Set the tuning fork vibrating. Its 

 writing point will mark a line synchronous with 

 that drawn by the signal during the experiment. 

 Kevolve the drum a little farther, until the 

 writing point of the muscle lever reaches the 

 point at. which contraction began. Set the 

 tuning fork vibrating again. Its writing point 

 will mark a line synchronous with the beginning 

 of contraction. The number of vibrations in the 

 tuning fork curve .between the two points just 

 recorded is the interval between the stimulation 

 of the muscle and the point at which the energy 

 set free was sufficient to move a load of 50 

 grams. Note this interval. 



After-load the muscle with 100, 150, 200, 250, 

 and 300 grams, and repeat the above experiment 

 after each addition of 50 grams. 



On coordinate paper set down as ordinates 

 the several loads employed and along the abscissa 

 the time " intervals in hundredths of a second. 

 Place a dot at the junction of -the 50-gram line 

 with the perpendicular cutting the abscissa at the 

 figure indicating the interval observed between 

 stimulation and the moment when the energy 



