Balth. van der Pol and H. Bremmer, Phil. Mag. 24, 141 and 825 (1937).Further articles on an analogous problem,ibid.25, 817 and 27, 261.

The explanation by B. Ray, Proc. Ind. Ass. for the Cultivation of Science 8 (1923), is not correct, for this reason.

F. Mierdel, Beiträge z. Physik d. freien Atmosphäre 8, 95 (1919).

Balth. van der Pol and H. Bremmer, Phil. Mag. 24, 141 and 825 (1937).Further articles on an analogous problem,ibid.25, 817 and 27, 261.

F. Mierdel, Beiträge z. Physik d. freien Atmosphäre 8, 95 (1919).

The explanation by B. Ray, Proc. Ind. Ass. for the Cultivation of Science 8 (1923), is not correct, for this reason.

H. C. van de Hulst, “Optics of spherical particles,” Thesis Utrecht, 1946;also published in Rech. Astr. de l’Observatoire d’Utrecht, 11, Part I. Formulae from this work will be quoted as (T. 5, 14) etc.

Balth. van der Pol and H. Bremmer, Phil. Mag. 24, 141 and 825 (1937).Further articles on an analogous problem,ibid.25, 817 and 27, 261.

F. Mierdel, Beiträge z. Physik d. freien Atmosphäre 8, 95 (1919).

Balth. van der Pol and H. Bremmer, Phil. Mag. 24, 141 and 825 (1937).Further articles on an analogous problem,ibid.25, 817 and 27, 261.

The explanation by B. Ray, Proc. Ind. Ass. for the Cultivation of Science 8 (1923), is not correct, for this reason.

See Jahnke-Emde, Tables of Functions (B. G. Teubner, Leipzig, 1933 edition), especially Fig. 105.

Pernter-Exner, Meteorologische Optik (W. Braumüller, Wien, 1910), p. 413 ff.

The outline given here follows the treatment by H. C. van de Hulst, reference 2, Chapter V.

The frequent use of the common term“glory” (cf. Webster) was considered unsuitable in an article of this kind.

H. C. van de Hulst, “Optics of spherical particles,” Thesis Utrecht, 1946;also published in Rech. Astr. de l’Observatoire d’Utrecht, 11, Part I. Formulae from this work will be quoted as (T. 5, 14) etc.

Airy’s theory. See any textbook on meteorological optics.

By comparing this asymptotic behavior of (8) with Eq. (1) the relative coefficients may be expressed in absolute units.

Dr. O. Struve has related to me that he observed an anti-corona through a nicol prism on a transatlantic flight, Sept. 15, 1946. It was strongly polarized and the dark and bright features rotated when the nicol was rotated. No radii or intensities were however estimated.

Early experiments by Fraunhofer indicated that this rule was correct for the first three rings of common coronae. The“wave-length of white light” is 0.57μ. See Pernter-Exner, p. 460.