f Science_, 1885, p. 85.]

[Footnote 422: _Observations at Redhill_, p. 221.]

[Footnote 423: _Am. Jour. of Science_, vol. xi., p. 169.]

[Footnote 424: _Month. Not._, vol. xix., p. 1.]

[Footnote 425: _Vierteljahrsschrift der Naturfors. Gesellschaft_
(Zurich), 1859, p. 252.]

[Footnote 426: Lockyer, _Chemistry of the Sun_, p. 428.]

[Footnote 427: Maunder, _Knowledge_, vol. xv., p. 130.]

[Footnote 428: _Month. Mon._, vol. l., p. 251.]

[Footnote 429: Maunder, _Knowledge_, vol. xvii., p. 173.]

[Footnote 430: _Astr. Nach._, No. 1,315.]

[Footnote 431: As late as 1866 an elaborate treatise in its support was
written by F. Coyteux, entitled _Qu'est-ce que le Soleil? Peut-il etre
habite?_ and answering the question in the affirmative.]

[Footnote 432: The subsequent researches of Pluecker, Frankland, Wuellner,
and others, showed that gases strongly compressed give an absolutely
unbroken spectrum.]

[Footnote 433: _Comptes Rendus_, t. lx., pp. 89, 138.]

[Footnote 434: _Ibid._, t. c., p. 595.]

[Footnote 435: _Bull. Meteor. dell Osservatorio dell Coll. Rom._, Jan.
1, 1864, p. 4.]

[Footnote 436: _Quart. Jour. of Science_, vol. i., p. 222.]

[Footnote 437: _Ann. de Chim. et de Phys._, t. xxii., p. 127.]

[Footnote 438: _Phil. Trans._, vol. clix., p. 575.]

[Footnote 439: _Les Mondes_, Dec. 22, 1864, p. 707.]

[Footnote 440: _Comptes Rendus_, t. lx., p. 147.]

[Footnote 441: _Proc. Roy. Society_, vol. xvi., p. 29.]

[Footnote 442: _Recherches sur le Spectre Solaire_, p. 38.]

[Footnote 443: _Am. Jour. of Science_, 1881, vol. xxi., p. 41. Hastings
stipulated only for some member of the triad, carbon, silicon, and
boron.]

[Footnote 444: Ranyard, _Knowledge_, vol. xvi., p. 190.]

[Footnote 445: Young, _The Sun_, p. 337, ed. 1897.]

[Footnote 446: H. Draper, _Quart. Journ. of Sc._, vol. i., p. 381; also
_Phil. Mag._, vol. xvii., 1840, p. 222.]

[Footnote 447: Reproduced in Arago's _Popular Astronomy_, plate xii.,
vol. 1.]

[Footnote 448: _Report Brit. Ass._, 1859, p. 148.]

[Footnote 449: _Phil. Trans._, vol. clii., p. 407.]

[Footnote 450: _Researches in Solar Physics_, part i., p. 20.]

[Footnote 451: Both the phrase and the method were suggested by Faye,
who estimated the average depth of the luminous sheath of spots at 2,160
miles. _Comptes Rendus_, t. lxi., p. 1082; t. xcvi., p. 356.]

[Footnote 452: _Month. Not._, vol. lv., p. 74.]

[Footnote 453: Sidgreaves, _Ibid._, p. 282; Cortie,