[87] First detected as such by Holden and Schaeberle in 1888, Monthly Notices, vol. xlviii., p. 388.
[88] Deslandres, Bulletin Astronomique, February, 1900.
[89] Astronomical Journal, Nos. 539, 547.
[90] Maunder, Knowledge, vol. xix., p. 39.
[91] Dr. Max Wolf places the point of nebular concentration in R.A. 12h 53m, D. +61° 20´, that assigned to the galactic pole being in R.A. 12h 49m, D. +62°. Königstuhl Publ., Bd. I., p. 174.
[92] T. J. J. See, 'Repulsive Forces in Nature,' Popular Astronomy, No. 100, December, 1902.
[93] The Earth's Beginnings, pp. 243-247.
[94] Cf. Moulton, Astrophysical Journal, vol. xxii., p. 165.
[95] Monthly Notices, vol. lx., p. 259.
[96] See Knowledge, vol. xiv., p. 50.