PHYSIOLOGY OF MOVEMENT. 



717 



There is no actual change in bulk in muscular contraction, the increase in 

 thickening being almost precisely proportionate to the decrease in length. 



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This fact may be demonstrated by connecting the sciatic nerve of a frog s leg 

 with the poles of an induction machine and then placing the leg m a bottle filled 

 with dilute saline solution, in the stopper of which is inserted a capillary tube. 

 Care should be taken that no air-bubbles are present in the bottle, that the bottle 

 is filled, and that the fluid ascends up a certain distance in the capillary tube.^ it 

 the leg is then thrown into contraction by passing a current through the wires, 



