* * * * *
There is another feature of glacial structure, intimately connected, by
similarity of position and aspect, with the stratification, which has
greatly perplexed the students of glacial phenomena. I allude to the
so-called blue bands, or bands of infiltration, also designated as
veined structure, ribboned or laminated structure, marginal structure,
and longitudinal structure. The difficulty lies, I believe, in the fact
that two very distinct structures, that of the stratification and the
blue bands, are frequently blended together in certain parts of the
glacier in such a manner as to seem identical, while elsewhere the one
is prominent and the other subordinate, and _vice versa_. According to
their various opportunities of investigation, observers have either
confounded the two, believing them to be the same, or some have
overlooked the one and insisted upon the other as the prevailing
feature, while that very feature has been absolutely denied again by
others who have seen its fellow only, and taken that to be the only
prominent and important fact in this peculiar structural character of
the ice.
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