44 EXPERIMENTAL PHYSIOLOGY 



ends to the hooks, lower into the bottle, and press the cork in 

 securely : the fluid should completely fill the bottle and capillary 

 to the exclusion of air-bubbles. Draw a little of the fluid out of the 

 capillary by filter paper, and mark the level at which the fluid then 

 stands. Hook wires from the secondary coil to the loops above 

 mentioned, and tetanise the muscle. If there were a diminution of 

 volume the level of the water in the capillary would fall. 



