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[8] R.S. Phil Trans. , 1783.
[9] See Kapteyn’s address to the Royal
Institution, 1908. Also Gill’s presidential
address to the British Association, 1907.
[10] Brit. Assoc. Rep. , 1905.
[11] R. S. Phil. Trans., 1803, 1804.
[12] Ibid, 1824.
[13] Connaisance des Temps, 1830.
[14] R. A. S. Mem. , vol. xlvii., p. 178;
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