Glacier ice is not like the solid blue ice on the surface of the water,
but consists of granules joined together by an intricate network of
capillary water, filled fissures. In exposed sections and upon the
surface of the ice can be observed “veined” or “banded” structure
veins of a denser blue color alternating with those of a lighter shade
containing air bubbles. The cause of this peculiar structure has been
the subject of much theorizing among investigators, but hitherto the
greatest authorities consider that the explanation of the phenomenon is
yet wanting.--_Goldthwaite’s Geographical Magazine._