[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. x.x.xv., p. 154) measured and photographed about thirty.]

[Footnote 542: Abney, _Phil. Trans._, vol. clxxv., p. 267.]

[Footnote 543: _Proc. Roy. Soc._, vol. x.x.xiv., 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 s.p.a.ce in which the main part of the coronal light is concentrated.]

[Footnote 545: _Proc. Roy. Soc._, vol. x.x.xiv., p. 414.]

[Footnote 546: _Report Brit. a.s.soc._, 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. clx.x.x., 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.]

[Footnote 556: _Comptes Rendus_, t. lxxiii., p. 434.]

[Footnote 557: _Wash. Obs._, 1867, App. ii., p. 195.]

[Footnote 558: Stokes, Anniversary Address, _Nature_, vol. x.x.xv., p.

114.]

[Footnote 559: _Comptes Rendus_, t. ci., p. 50.]

[Footnote 560: _Harvard Annals_, vol. xviii., p. 99.]

[Footnote 561: Wesley, _Phil. Trans._, vol. clx.x.x., p. 350.]

[Footnote 562: _Harvard Annals_, vol. xviii, p. 108.]

[Footnote 563: _Lick Report_, p. 20.]

[Footnote 564: _Ibid._, p. 14.]

[Footnote 565: _Ibid._, p. 155.]

[Footnote 566: _Pub. Astr. Soc. of the Pacific_, vol. iii., p. 158.]

[Footnote 567: Professor Holden concluded, with less qualification, "that so-called 'polar' rays exist at all lat.i.tudes on the sun's surface." _Lick Report_, p. 19.]

[Footnote 568: Holden, _Report on Eclipse of December, 1889_, p. 18; Charroppin, _Pub. Astr. Soc. of the Pacific_, vol. iii., p. 26.]

[Footnote 569: Published as the Frontispiece to the _Observatory_, No.

160.]

[Footnote 570: Wesley, _Ibid._, p. 107.]

[Footnote 571: _Lick Observatory Contributions_, No. 4, p. 108.]

[Footnote 572: _Astr. and Astrophysics_, vol. xiii. p. 307.]

[Footnote 573: Lockyer, _Phil. Trans._, vol. clx.x.xvii., p. 592.]

[Footnote 574: He died in London, November 20, 1898.]

[Footnote 575: _Bull. Acad. St. Petersbourg_, t. vi., p. 253.]

[Footnote 576: W. H. Wesley, _Phil. Trans._, vol. cxc, p. 204.]

[Footnote 577: _Lick Reports on Eclipse of January 1, 1889_, p. 204.]

[Footnote 578: _Astroph. Jour._, vol. xi., p. 226.]

[Footnote 579: _Observatory_, vol. xxi., p. 157.]

[Footnote 580: _The Indian Eclipse_, 1898, p. 114.]

[Footnote 581: _Science_, June 22, 1900; _Astroph. Jour._, vol. xii., p.

370.]

[Footnote 582: _Ann. der Physik_, Bd. xlviii., p. 528. See also Wood, _Physical Review_, vol. iv., p. 191, 1896.]

[Footnote 583: _Science_, August 3, 1900.]

[Footnote 584: _Lick Observatory Bulletin_, No. 9.]

[Footnote 585: _Observatory_, vol. xxiv., pp. 321, 375.]