Page:Transactions of the Geological Society, 1st series, vol. 2.djvu/542

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On the Vitreous Tubes found near Drigg, in Cumberland

The sand hillocks of Drigg, though of inconsiderable elevation, are not unfavourably situated for promoting a discharge, since they present themselves as the first and highest object in front of the marshes of the Irt to clouds coming from the sea. Should the explanation of the Sand Tubes, which is now offered, be admitted, some judgment may be formed of the intensity of the heat developed in great electrical explosions.