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24 OLDER ELECTROCHEMICAL VIEWS, chap. ii.
only at high temperatures, and possessed an excess (one atomic charge) of one kind of electricity. Nitric oxide (NO), which has one free valence, offered a great difficulty in this con- nection, for it is stable at the ordinary temperature, and does not conduct the current.
In concluding, Helmholtz remarked on the great im- portance of electrochemistry.
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