[669] Published in Astroph. Jour., vols. i. to vi.

[670] Astr. and Astrophysics, vol. xi., p. 793.

[671] Astroph. Jour., vol. vi., p. 95.

[672] Annales de l'Observatoire de Nice, t. iii., 1890.

[673] Trans. Royal Society of Edinburgh, vol. xxxvi., p. 99.

[674] Rev. A. L. Cortie, Astr. and Astrophysics, vol. xi., p. 401. Specimens of his photographs were given by Ranyard in Knowledge, vol. xiii., p. 212.

[675] Ann. d. Phys., Bd. cxvii., p. 296.

[676] Comptes Rendus, t. lxiii., p. 647.

[677] Ibid., t. lxxxvi., p. 317. Some half dozen of these identifications have proved fallacious.

[678] Chemistry of the Sun, p. 143.