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. 



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 in a bottle filled 

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

 pare 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. If 

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



