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a second[19] was traversing a cold nebulous
atmosphere, and was heated to incandes-
cence by friction, like a meteor in our atmo-
sphere, leaving a luminous train behind it.
It almost disappeared, and on April 26th it
was of the sixteenth magnitude; but on Au-
gust 17th it brightened to the tenth, show-
ing the principal nebular band in its spec-
trum, and no sign of approach or recession.
621
