PRACTICAL EXERCISES 



785 



so that the trace may not run over on itself. Cut off the drum-paper, 

 write on it a brief description of the experiment, with the time-value of 



G^S-H,:^ 



eg|fa -S~ 



S^sliiJ^H 



III ill! I 



' 





== S-2SH 



each vibration of the fork, the date, and the name of the maker of the 

 tracing, and then varnish it. An exactly similar tracing can be obtained 

 by directly stimulating the muscle (curarized or not). 



50 



