[Footnote 74: _Additamentum in Mensuras Micrometricas_, p. 28.]

[Footnote 75: Elkin's corrected result (in 1897) for the parallax of Vega is 0082".]

[Footnote 76: _Mem. Roy. Astr. Soc._, vol. xi., p. 61.]

[Footnote 77: That numbered 21,185 in Lalande's _Hist. Cel._, found by Argelander to have a proper motion of 4734", and by Winnecke a parallax of O511". _Month. Not._, vol. xviii., p. 289.]

[Footnote 78: _Fund. Astr._, p. 309.]

[Footnote 79: _Mem. Pres. a l'Ac. de St. Petersb._, t. iii.]

[Footnote 80: _Phil. Trans._, vol. cx.x.xvii., p. 79.]

[Footnote 81: _Mem. Roy. Astr. Soc._, vols. xxviii. and x.x.xii.]

[Footnote 82: _Ibid._, vol. xlvii., p. 327.]

[Footnote 83: _Memoires de St. Petersbourg_, t. x.x.xv., No. 3, 1887; revised in _Astr. Nach._, Nos. 3,729-30, 1901.]

[Footnote 84: _Astronomical Journal_, Nos. 213, 501.]

[Footnote 85: _Astr. Nach._, Nos. 2,999, 3,000.]

[Footnote 86: _Veroffentlichungen der Grossh. Sternwarte zu Karlsruhe_, Bd. iv., 1892.]

[Footnote 87: _Proceedings Amsterdam Acad. of Sciences_, Jan. 27, 1900.]

[Footnote 88: _Astr. Jour._, No. 457.]

[Footnote 89: _Ibid._, Nos. 276, 497.]

[Footnote 90: _Phil. Trans._, vol. xcvi., p. 230.]

[Footnote 91: _Mem. Pres. a l'Ac. de St. Petersbourg_, t. iii., p. 603 (read Feb. 5, 1837).]

[Footnote 92: _Die Centralsonne, Astr. Nach._, Nos. 566-567, 1846.]

[Footnote 93: Sir J. Herschel, note to _Treatise on Astronomy_, and _Phil. Trans._, vol. cxxiii., part ii., p. 502.]

[Footnote 94: The position is (as Sir J. Herschel pointed out, _Outlines of Astronomy_, p. 631, 10th ed.) placed beyond the range of reasonable probability by its remoteness (fully 26) from the galactic plane.]

[Footnote 95: Madler in _Westermann's Jahrbuch_, 1867, p. 615.]

[Footnote 96: Letter from Bessel to Sir J. Herschel, _Month. Not._, vol.

vi., p. 139.]

[Footnote 97: Wolf, _Gesch. d. Astr._, p. 743, _note_.]

[Footnote 98: _Astr. Nach._, Nos. 745-748.]

[Footnote 99: _Astr. Jour._, No. 440.]

[Footnote 100: Adopting Elkin's revised parallax for Procyon of 0325".]

[Footnote 101: _Astr. Nach._, Nos. 1371-1373.]

[Footnote 102: _Ueber die Doppelsterne_, Bericht, 1827, p. 22.]

[Footnote 103: _Ueber die Doppelsterne_, Bericht, 1827, p. 25.]

[Footnote 104: _Mensurae Micr._, p. xcix.]

[Footnote 105: _Stellarum Fixarum imprimis Duplicium et Multiplic.u.m Positiones Mediae_, pp. cxc., cciii.]

[Footnote 106: For instance, the southern stars, 36A Ophiuchi (itself double) and 30 Scorpii, which are 12' 10" apart. _Ibid._, p. cciii.]

[Footnote 107: _Stellarum Fixarum_, etc., p. ccliii.]

[Footnote 108: _etudes d'Astronomie Stellaire_, 1847, p. 82.]

[Footnote 109: _Ibid._, p. 86.]

[Footnote 110: See Encke's criticism in _Astr. Nach._, No. 622.]

[Footnote 111: _Phil. Trans._, vol. cxiv., part iii., 1824.]

[Footnote 112: _Conn. d. Temps_, 1830.]

[Footnote 113: _R. A. S. Mem._, vol. v., p. 178, 1833.]

[Footnote 114: _Astr. and Astrophysics_, vol. xii., p. 581.]

[Footnote 115: _Popular Astr._, vol. i., p. 243.]

[Footnote 116: _Phil. Trans._, vol. cxxiii., and _Results_, etc., Introd.]

[Footnote 117: _Results of Astronomical Observations made during the years 1834-8 at the Cape of Good Hope._]

[Footnote 118: _Results_, etc., p. 147.]

[Footnote 119: See Proctor's _Universe of Stars_, p. 92.]

[Footnote 120: _A Treatise on Astronomy_, 1833, p. 406.]

[Footnote 121: _Results_, etc., p. 139.]

[Footnote 122: _Ibid._, pp. 24, 142.]