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

by Agnes M. Clerke

[388] Ibid., 1861, p. 77; Annalen der Physik, Bd. cxix., p. 275. A similar conclusion, reached by Balfour Stewart in 1858, for heat-rays (Ed. Phil. Trans., vol. xxii., p. 13), was, in 1860, without previous knowledge of Kirchhoff's work, extended to light (Phil. Mag., vol. xx., p. 534); but his experiments wanted the precision of those executed at Heidelburg.

[389] Miscellaneous Works, vol. i., p. 189.

[390] Ed. Phil. Trans., vol. ix., p. 458.

[391] Ibid., vol. xii., p. 519.

[392] Quart. Jour. Chem. Soc., vol. x. p. 79.

[393] A facsimile accompanied Sir H. Roscoe's translation of Kirchhoff's "Researches on the Solar Spectrum" (London, 1862-63).

[394] Estimated by Kirchhoff's at a trillion to one. Abhandl., 1861, p. 79.

[395] Phil. Mag., vol. xxvii. (3rd series), p. 90.

[396] L'Institut, Feb. 7, 1849, p. 45; Phil. Mag., vol. xix. (4th series), p. 193.

[397] Ann. d. Phys., vol. cxviii., p. 110.