Baily, British Association Catalogue of Stars, pp. 7, 23.

Outlines of Astronomy, 4th ed. sect. 781, p. 522. Results of Observations at the Cape of Good Hope, &c., p. 37.

See De Morgan, Study of Mathematics, in U.K.S. Library, p. 81.

Loomis, On the Aurora Borealis. Smithsonian Transactions, quoting Parry’s Third Voyage, p. 61.

Watts’ Dictionary of Chemistry, vol. ii. p. 790.

Philosophical Transactions, (1856) vol. 146, Part i. p. 297.

Airy, On Tides and Waves, Encyclopædia Metropolitana, p. 345. Scott Russell, British Association Report, 1837, p. 432.

Hugenii Cosmotheoros, pp. 117, 118. Laplace’s Système, translated, vol. i. p. 67.

Grant’s History of Physical Astronomy, p. 129.

Baily’s Account of Flamsteed, p. lix.

Jamin, Cours de Physique, vol. i. p. 152.

Faraday, Chemical Researches, p. 393.

Proceedings of the Royal Society, 30th November, 1866.

Herschel, Physical Geography, § 40.