h. 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.]

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

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

[Footnote 558: Stokes, Anniversary Address, _Nature_, vol. xxxv., p.
114.]

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

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

[Footnote 561: Wesley, _Phil. Trans._, vol. clxxx., 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 latitudes 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. clxxxvii., p.