MUSCLE-XERVE. 



Place the drum contact arrangement in circuit with the primary. 

 Adjust the myograph lever to the smoked surface of the drum. 

 Allow the drum to revolve at its greatest speed. According to the 

 arrangement shown in Fig. n, six contractions will occur during 



Jfl 



FIG. ii. Drum Arrangement for Muscle-nerve Stimulation, d, Drum, m, mus- 

 cle ; , nerve ; e, electrodes ; , battery ; , inductorium ; f, collar with contacts 

 which, as drum revolves, make and break primary circuit with/", metal strip. 



every revolution of the drum. Ever}* sixth contraction will be re- 

 corded at the same place on the drum. In this way a number of 

 superimposed contractions are recorded. 



Allow the drum to revolve until the muscle ceases to respond by 

 a contraction. What changes does the contraction curve undergo 

 with the progression of fatigue? 



Compare the fatigue curve with the temperature curves ob- 

 tained in the previous experiments. 



2. Make a fresh muscle-nerve preparation. Let the drum re- 



