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[462] Rep. Spectr. Class. Com., I. A. U., 1922.

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[465] Lockyer and Baxandall, Proc. Roy. Soc., 77A, 550, 1906.

[466] Belopolsky, Pub. Ac. Imp. St. Pet., 6, 12, 1913; Pulk. Bul., 6, 10, 1915.

[467] Lockyer and Baxandall, Proc. Roy. Soc., 77A, 550, 1906.

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[469] Lockyer, Pub. Sol. Phys. Com., 1904.

[470] Wright, L. O. B. 332, 1921.