A Popular History of Astronomy During the Nineteenth Century / Fourth Edition

by Agnes M. Clerke

[516] Comptes Rendus, t. lxvii., p. 839.

[517] Month. Not., vol. xxvii., p. 88.

[518] Proc. Roy. Soc., vol. xvii., p. 123.

[519] Washington Observations, 1867, App. ii., Harkness's Report, p. 60.

[520] Am. Jour., vol. xlviii. (2nd series), p. 377.

[521] Am. Jour., vol. xi. (3rd series), p. 429.

[522] Campbell, Astroph. Jour., vol. x., p. 186.

[523] Keeler, Reports on Eclipse of January 1, 1889, p. 47.

[524] Everything in such observations depends upon the proper manipulation of the slit of the spectroscope.

[525] Mem. R. A. S., vol. xli., p. 435.