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

by Agnes M. Clerke

[1536] Astroph. Journ., vol. xiii., p. 80.

[1537] Proc. Roy. Soc., vol. xxxiii., p. 425; Report Brit. Assoc., 1882, p. 444. An impression of the four lower lines in the same spectrum was almost simultaneously obtained by Dr. Draper. Comptes Rendus, t. xciv., p. 1243.

[1538] Proc. Roy. Soc., vol. xlviii., p. 213.

[1539] Month. Not., vol. xlviii., p. 360.

[1540] Proc. Roy. Soc., vol. xlvi., p. 40; System of the Stars, p. 79.

[1541] Sitzungsb., Berlin, February 13, 1890.

[1542] Wash. Obs., vol. xxv., App. i., p. 226.

[1543] Comptes Rendus, t. xcii., p. 261.

[1544] Month. Not., vol. xliii., p. 255.

[1545] Harvard Annals, vol. xviii., p. 116.