1826.] Neio Scientific Books. 77 



alkaline solution, however weak, whether it be of soda, potash, 

 barytes, or strontia, leaves the alkali electrified positively; 

 thirdly, that when other solutions, either saline or acid, are 

 employed, evaporation leaves the body which was combined 

 with the water, electrified negatively. 



Of the numerous saline solutions which were essayed, that of 

 muriate of soda was naturally the one which excited the greatest 

 interest. It formed no exception to the rule. Hence it can 

 hardly be doubted that evaporation from the surface of the sea 

 forms one of the most important sources of atmospheric electri- 

 citj% Even lakes and rivers must have their influence, since 

 their waters are never perfectly pure. 



Article XIII. 

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