If a box six feet deep were filled with seawater and the water allowed to evaporate in the sun, there would be two inches of 'salt left at the bottom, faking the average depth of the ocean to be three miles, there would be a layer of pure salt 230 feet thick on the bed of the Atlantic
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Page 2 Advertisements Column 5, Evening Star, Issue 7943, 26 June 1889
Page 2 Advertisements Column 5 Evening Star, Issue 7943, 26 June 1889
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