Statistics for occurrence #1 of “Professor Tyndall” in chapter 6 of Thomas Wentworth Higginson, Irene E. Jerome., In a fair country:

... Yet that same ice becomes white and opaque when pulverized, its fragments being then intermingled with air again.—just as colorless glass may be crushed into white powder. On the other hand, Professor Tyndall has converted slabs of snow to ice by regular pressure, and has shown that every Alpine glacier begins as a snow-drift at its summit, and ends in a transparent ice-cavern below. The blue blocks whi...

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