[102] The uncertainty affecting the best attainable results in weather-cycle investigation is rendered strikingly apparent by a comparison of the able and laborious papers by H. W. Clough (Astrophysical Journal, vol. xxii., p. 42), and C. Easton (Petermann's Geogr. Mittheilungen, 1905, Heft VIII., and Proceedings Amsterdam Academy of Sciences, June 24, 1905).
[103] R. T. A. Innes, Reference Catalogue, p. 155A.
[104] Harvard Annals, vol. liii., p. 61, where, however, the reversal is explained by a shifting of the plane of rotation.
[105] G. H. Darwin, Philosophical Transactions, vol. clxxii., p. 526; Moulton, Astrophysical Journal, vol. xi., p. 110.
[106] Monthly Notices, vol. ix., p. 91.
[107] F. E. Ross, Lick Bulletin, No. 82.
[108] Annuaire du Bureau des Longitudes, 1898.