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

by Agnes M. Clerke

[348] Manuel Johnson, Mem. R.A.S., vol. xxvi., p. 197.

[349] Astronomie Théorique et Pratique, t. iii., p. 20.

[350] Wolf, Gesch. der Astr., p. 654.

[351] Month. Not., vol. xvii., p. 241.

[352] Mem. R.A.S., vol. xxvi., p. 200.

[353] Astr. Nach., No. 495.

[354] Gehler's Physikalisches Wörterbuch, art. Sonnenflecken, p. 851.

[355] Zweite Abth., p. 401.

[356] Annalen der Physik (Poggendorff's), Bd. lxxxiv., p. 580.

[357] Phil. Trans., vol. cxlii., p. 103.