PRACTICAL EXERCISES 



619 





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 ELB^-ri^SfiS 



Now stop the drum, mark with a pencil the position of the feet of the 

 stand carrying the myograph plate, take the writing-point off the drum, 

 and surround the muscle with pounded ice or snow. After a couple 

 of minutes brush away any ice which would hinder the movement of 

 the muscle, rapidly replace the stand in exactly its original position, 

 with the writing-point on the drum, and take another tracing. Again 



