THE GEAPHIC METHOD AND THE STUDY OP 

 MUSCLE PHYSIOLOGY. 



It is impossible to study the physiology of muscle to the best 

 advantage without the employment of the graphic method ; 



and, on the other hand, no 

 tissue is so well adapted for 

 investigation by the isolated 

 method — i. e., apai-t from the 

 animal to which it actually 

 belongs — as muscle ; hence 

 the convenience of introduc- 

 ing at an early period our 

 study of the physiology of 

 contractile tissue and illus- 

 trations of the graphic meth- 

 od, the general principles of 

 which have already been 

 considered. 



The descriptions in the 

 text will be brief, and the 

 student is recommended to 

 examine the figures and ac- 

 companying explanations 

 with some care. 



Chronographs, Bevolvii^ 



Cylinders, etc.— Fig. 160 rep- 



■^ ^.„«-,v * :, ■ A ^ resents one of the earliest 



Fig. 160.— Origmal chronometer, devised by . . j_ j. j.i 



Thomas Ifoung, for measuring minute forms of apparatus for the 

 portions of time (after McKendrick). a. a j. i • j; . j. 



cylinder revolving on vertical axis ; 6, measurement OI bnei inter- 

 weightactingasmotivepower; cd.small _„i„ „f timo nnndetlno- nf n 

 balls for regulating the velocity of the ^^^^ °^ time, consisting 01 a 

 cylinder; «, marker recording a line on simple mechanism for pro- 

 ducing the movement of a 



cylinder, which may be covered with smoked paper, or other- 



