[Footnote 519: _Washington Observations_, 1867, App. ii., Harkness's Report, p. 60.] [Footnote 520: _Am. Jour._, vol. xlviii. (2nd series), p. 377.] [Footnote 521: _Am. Jour._, vol. xi. (3rd series), p. 429.] [Footnote 522: Campbell, _Astroph. Jour._, vol. x., p. 186.] [Footnote 523: Keeler, _Reports on Eclipse of January 1, 1889_, p. 47.] [Footnote 524: Everything in such observations depends upon the proper manipulation of the slit of the spectroscope.] [Footnote 525: _Mem. R. A. S._, vol. xli., p. 435.] [Footnote 526: _Comptes Rendus_, t. lxvii., p. 1019.] [Footnote 527: _Mem. R. A. S._, vol. xli., p. 43.] [Footnote 528: _Comptes Rendus_, t. xciv., p. 1640.] [Footnote 529: Young, _Pop. Astr._, Oct., 1897, p. 333.] [Footnote 530: J. Evershed, _Indian Eclipse_, 1898, p. 65; _Month. Not._, vol. lviii., p. 298; _Proc. Roy. Soc._, Jan. 17, 1901.] [Footnote 531: Frost, _Astroph. Jour._, vol. xii., p. 85; Lord, _Ibid._, vol. xiii., p. 149.] [Footnote 532: _Comptes Rendus_, t. cxvii., No. 1; _Jour. Brit. Astr. Ass._, vol. iii., p. 532.] [Footnote 533: Lockyer, _Phil. Trans._, vol. clvii., p. 551.] [Footnote 534: The rosy envelope of prominence-matter was so named by Lockyer in 1868 (_Phil. Trans._, vol. clix., p. 430).] [Footnote 535: According to Trouvelot (_Wash. Obs._, 1876, App. iii., p. 80), the subtracted matter was, at least to some extent, accumulated in the polar regions.] [Footnote 536: _Bull. Phil. Soc. Washington_, vol. iii., p. 118.] [Footnote 537: _Mem. R. A. S._, vol. xli., 1879.] [Footnote 538: _Astr. Nach._, No. 1,737.] [Footnote 539: _Correspondence with Newton_, pp. 181-184; Ranyard, _Mem. Astr. Soc._, vol. xli., p. 501.] [Footnote 540: S. P. Langley, _Wash. Obs._, 1876, App. iii., p. 209; _Nature_, vol. lxi., p. 443.] [Footnote 541: Schuster (_Proc. Roy. Soc._, vol. xxxv., p. 154) measured and photographed about thirty.] [Footnote 542: Abney, _Phil. Trans._, vol. clxxv., p. 267.] [Footnote 543: _Proc. Roy. Soc._, vol. xxxiv., p. 409. Experiments directed to the same end had been made by Dr. O. Lohse at Potsdam, 1878-80. _Astr. Nach._, No. 2,486.] [Footnote 544: The sensitiveness of chloride of silver extends from _h_ to H; that is, over the upper or more refrangible half of the space in which the main part of the coronal light is concentrated.] [Footnote 545: _Proc. Roy. Soc._, vol. xxxiv., p. 414.] [Footnote 546: _Report Brit. Assoc._, 1883, p. 351.] [Footnote 547: Maunder, _Indian Eclipse_, p. 125; _Eclipse of 1900_, p. 143.] [Footnote 548: _Astr. and Astrophysics_, vol. xiii., p. 662.] [Footnote 549: See _infra_, p. 197.] [Footnote 550: Abney, _Phil. Trans._, vol. clxxx., p. 119.] [Footnote 551: _Comptes Rendus_, t. xcvii., p. 592.] [Footnote 552: _Memoirs National Ac. of Sciences_, vol. ii., p. 102.] [Footnote 553: _Wash. Obs._, 1867, App. ii., p. 64.] [Footnote 554: _The Sun_, p. 357.] [Footnote 555: _Proc. Roy. Soc._, vol. xvii., p. 289.]