_Abhandl. Akad. der Wiss._, Leipzig, 1857, Bd. iii., p.
295.]

[Footnote 1529: _Month. Not._, vol. lii., p. 31.]

[Footnote 1530: _Proc. Roy. Soc._, 1874, p. 251.]

[Footnote 1531: _Publ. Astr. Pac. Soc._, vol. ii., p. 278.]

[Footnote 1532: _System of the Stars_, p. 257.]

[Footnote 1533: _Proc. Roy. Soc._, vol. xlix., p. 399.]

[Footnote 1534: _Potsdam Publ._, Bd. vii., Th. i.]

[Footnote 1535: _Astr. Nach._, No. 2,714; Schoenfeld, _V. J. S. Astr.
Ges._, Jahrg. xxi., p. 58.]

[Footnote 1536: _Astroph. Journ._, vol. xiii., p. 80.]

[Footnote 1537: _Proc. Roy. Soc._, vol. xxxiii., p. 425; _Report Brit.
Assoc._, 1882, p. 444. An impression of the four lower lines in the same
spectrum was almost simultaneously obtained by Dr. Draper. _Comptes
Rendus_, t. xciv., p. 1243.]

[Footnote 1538: _Proc. Roy. Soc._, vol. xlviii., p. 213.]

[Footnote 1539: _Month. Not._, vol. xlviii., p. 360.]

[Footnote 1540: _Proc. Roy. Soc._, vol. xlvi., p. 40; _System of the
Stars_, p. 79.]

[Footnote 1541: _Sitzungsb._, Berlin, February 13, 1890.]

[Footnote 1542: _Wash. Obs._, vol. xxv., App. i., p. 226.]

[Footnote 1543: _Comptes Rendus_, t. xcii., p. 261.]

[Footnote 1544: _Month. Not._, vol. xliii., p. 255.]

[Footnote 1545: _Harvard Annals_, vol. xviii., p. 116.]

[Footnote 1546: _Sid. Mess._, vol. ix., p. 1.]

[Footnote 1547: _Knowledge_, vol. xv., p. 191.]

[Footnote 1548: _Month. Not._, vol. xlix., p. 65.]

[Footnote 1549: _System of the Stars_, p. 269.]

[Footnote 1550: _Astr. Nach._, Nos. 2,749, 2,754.]

[Footnote 1551: Vogel, _Astr. Nach._, 2,854.]

[Footnote 1552: _Nature_, vol. xliii., p. 419.]

[Footnote 1553: _L'Astronomie_, t. xl., p. 171.]

[Footnote 1554: _Astr. Nach._, Baende xlvii., p. 1; xlviii., p. 1; xlix.,
p. 81. Pickering, _Mem. Am. Ac._, vol. xi., p. 180.]

[Footnote 1555: Gould on Celestial Photography, _Observatory_, vol. ii.,
p. 16.]

[Footnote 1556: _Annals N. Y. Acad. of Sciences_, vol. vi., p. 239,
1892; Elkin, _Publ. Astr. Pac. Soc._, vol. iv., p. 134.]

[Footnote 1557: _Trans. Yale Observatory_, vol. i., pt. i.]

[Footnote 1558: _Astroph. Jour._, vol. xiii., p. 56.]

[Footnote 1559: _Astr. Nach._, No. 2,719.]

[Footnote 1560: _Ibid._, No. 2,726.]

[Footnote 1561: _Ibid._, No. 2,730.]

[Footnote 1562: _Month. Not._, vol. xlvii., p. 24.]

[Footnote 1563: _Les Mondes_, t. iii., p. 529.]

[Footnote 1564: Mouchez, _Comptes Rendus_, t. cvi., p. 912.]

[Footnote 1565: _Ast