PHYSICAL PARADOXES. 



other ten, and so on indefinitely. Having 

 three gallons at the beginning of the day, 

 he could keep renewing the original three, 

 and as frequently supplying seven for working 

 a factory. 



It is obvious that what applies to three 

 gallons and seven applies to thirty and seventy, 

 or to 3,000 and 7,000. It is also plain that 

 if the seven gallons were not used in factory 

 work, they could be employed to make twenty- 

 three gallons more, these to make seventy- 

 six, and so on indefinitely. There was literally 

 no limit to the liquid air and the power 

 which, without an additional ounce of coal 

 or other fuel supplied, would grow, like the 

 great herb out of the small mustard-seed, from 

 the three gallons with which the development 

 began. 



Such a wonderful agent was to revolutionise 

 manufactures and travel. Engines driven by 

 coal, oil, or gas would be superseded in the 

 factories and on the railways of five continents. 

 Ships would cross the Atlantic in three days, 

 driven by liquid air, without having to carry 

 a ton of fuel. Air-ships would at last success- 

 fully cleave the sky, and submarines would 

 plough the depths of ocean with the help of a 

 beneficent agent which would not only provide 

 them with power but would constantly renew 

 a pure atmosphere for the under-water navi- 

 gators to breathe. 



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