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[4] The experiment had been made be-
fore by one who did not understand its mean-
ing;. But Sir George G. Stokes had already
given verbally the true explanation of Frauen-
hofer lines.
˜
˜
[5] Abh. d. KAn. BAhm. d. Wiss .,
Bd. ii., 1841-42, p. 467. See also Fizeau in
the Ann. de Chem. et de Phys ., 1870, p.
211.
431