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

[Footnote 1535: _Astr. Nach._, No. 2,714; Schonfeld, _V. J. S. Astr.

Ges._, Jahrg. xxi., p. 58.]

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

[Footnote 1537: _Proc. Roy. Soc._, vol. x.x.xiii., p. 425; _Report Brit.

a.s.soc._, 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._, Bande 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: _Astr. Nach._, No. 3,422.]

[Footnote 1566: _Ibid._, No. 3,441.]

[Footnote 1567: _Ibid._, Nos. 3,018, 3,032.]

[Footnote 1568: _Journ. Brit. Astr. a.s.soc._, vol. ix., p. 133.]

[Footnote 1569: _Astr. Nach._, No. 3,253.]

[Footnote 1570: _Observatory_, vol. xxi., pp. 351, 386.]

[Footnote 1571: Reproduced in _Astroph. Journ._, vol. xi., p. 324.]

[Footnote 1572: _Ibid._, p. 347.]

[Footnote 1573: _Astr. Nach._, No. 3,704.]

[Footnote 1574: _Sitzungsb. Bayer. Akad._, March 23, 1901.]

[Footnote 1575: _Annals of the Cape Observatory_, vols. iii., iv., v.]

[Footnote 1576: _Month. Not._, vol. lx., p. 381.]

[Footnote 1577: D. Klumpke, _Observatory_, vol. xv., p. 305.]

[Footnote 1578: Gilbert, _Sid. Mess._, vol. i., p. 288.]

[Footnote 1579: _Astr. Papers for the Amer. Ephemeris_, vol. viii., pt.

ii.]

[Footnote 1580: _Nature_, vol. xxiv., p. 91; _Dunsink Observations_, pt.

v., 1884.]

[Footnote 1581: Elkin, _Report for 1891-92_, p. 25; Newcomb, _The Stars_, p. 151.]