THE BUBBLE PROTECTED. 



271 



fTOJS 8 HUBBLE. 



tractile force in a babble which gradually begins to drive 

 the air out of it when you stop blowing in, if you leave the 

 pipe open. You see this by the bubble's growing gradu- 

 ally smaller and smaller." 



When Lawrence and John had arrived at about this 

 point in their conversation, the officer in charge struck 

 eight bells. Those who had been making observations im- 

 mediately went below with their sextants and the lunch- 

 eon-bell ran^. 



