_Astr. Jour._, No. 440.]

[Footnote 100: Adopting Elkin's revised parallax for Procyon of 0.325".]

[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 Multiplicum
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.]

[Footnote 123: _Phil. Trans._, vol. cxxiii., p. 503.]

[Footnote 124: _Results_, etc., p. 136.]

[Footnote 125: Loomis, _Month. Not._, vol. xxix., p. 298.]

[Footnote 126: See the Author's _System of the Stars_, pp. 116-120.]

[Footnote 127: _Outlines of Astr._, App. I.]

[Footnote 128: _Phil. Trans._, vol. cxix., p. 27.]

[Footnote 129: Dr. Dreyer's New General Catalogue, published in 1888 as
vol. xlix. of the Royal Astronomical Society's _Memoirs_, is an
enlargement of Herschel's work. It includes 7,840 entries, and was
supplemented, in 1895, by an "Index Catalogue" of 1,529 nebulae
discovered 1888 to 1894. _Mem. R. A. S._, vol. li.]

[Footnote 130: A list of 10,320 composite stars was drawn out by him in
order of right ascension, and has been published in vol. xl. of _Mem. R.
A. S._; but the data requisite for their formation into a catalogue were
not forthcoming. See Main's and Pritchard's _Preface_ to above, and
Dunkin's