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of the solar black lines increased in strength
towards sunset, and attributed them to ab-
sorption in the earth’s atmosphere. He sug-
gested that the others were due to absorp-
tion in the sun’s atmosphere. Thereupon
Professor J. D. Forbes pointed out that dur-
ing a nearly total eclipse the lines ought to
be strengthened in the same way; as that
part of the sun’s light, coming from its edge,
420