Jackson — A New Method of Producing Tension in Liquids. 113 



vibration. This appears to be due to eddies produced by the 

 violent and rapid vibration of the water column in the manometer. 

 It is probable that liquid tension plays a much more important 

 part in nature than is usually thought. Indeed, the fact that 

 liquids are capable of exerting a pull is often regarded as a mere 

 laboratory experience, interesting but inapplicable in everyday 

 life. But it may be that certain phenomena, which have hitherto 

 received other explanations, are really evidences of liquid tension. 

 For instance, large stones are known to have been dislodged from 

 the facework of sea-walls, and this has been put down to pressure 

 of compressed air and of water behind the stone, but may it not 

 have been due rather to pull of the receding water on the face of 

 the stone ? 



