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

by Agnes M. Clerke

[1639] Optics, p. 107 (2nd ed., 1719).

[1640] Observatory, vol. viii., p. 85.

[1641] Holden on Celestial Photography, Overland Monthly, Nov., 1886.

[1642] Observatory, vol. xv., p. 283.

[1643] Bailey, Astroph. Jour., vol. x., p. 255.

[1644] Harvard Circulars, Nos. 2, 18, 24, 33;

[1645] Loewy, Bull. Astr., t. i., p. 286; Nature, vol. xxix., p. 36.

[1646] Nature, vol. xxiv., p. 389.

[1647] Ibid., vol. xxix., p. 470.

[1648] Trans. R. Dublin Soc., vol. iii., p. 61.