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[2] Astr. Nach. , 2,944.
[3] Acad. des Sc. , Paris; C.R. , lxxxiii.,
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[4] Mem. Spettr. Ital. , xi., p. 28.
[5] R. S. Phil. Trans ., No. 1.
[6] Grant’s Hist. Ph. Ast ., p. 267.
[7] Nature , November 12th, 1908.
[8] Ast. Nach ., Nos. 791, 792, 814,
546
