401 (Read April 2Bth, 1901.) Common Salt Or Sodium Chloride Is
Downloaded from http://pygs.lyellcollection.org/ at Rice University on July 24, 2015 401 ON THE CIRCULATION OF SALT AND ITS BEARING ON GEOLOGICAL PROBLEMS, MORE PARTICULARLY THAT OF THE GEOLOGICAL AGE OF THE EARTH. BY WILLIAM ACKROYD, F.I.C., F.C.S., PUBLIC ANALYST FOR HALIFAX. (Read April 2bth, 1901.) INTRODUCTION. Common Salt or Sodium Chloride is probably the most widely distributed of all sodium compounds, as it is one of the most soluble. During our investigation of the underground waters of N.W. York• shire, a fruitful aspect of its solubility was presented to us in the disappearance of three tons of salt in a runnel of 19,800 gallons per day. It went down the Smelt Mill Water Sink and reappeared after 10 days at Malham Cove, where the amount of combined chlorine in the water suddenly rose from one up to six parts per 100,000, and in the course of another eight days slowly fell to the normal unit.* We had a similar experience at Clapham. It is apparent, therefore, that any salt in the soil, or in underground channels is carried quickly away by the water, and such soil or underground channels would be thenceforth free from the compound, unless in the course of disintegration fresh quantities were exposed for solution. This, however, is so slow a process that it quite fails to account for the enormous amounts of chloride annually conveyed by rivers to the sea. The position is, perhaps, better seen in the following statement of fact:—The Widdop Reservoir, belonging to the Halifax Corpora• tion, contains some 640*5 millions of gallons of water, and I estimate it to contain 55 tons of salt.
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