Principia, bk. iii. Prop. VI. Motte’s translation, vol. ii. p. 220.

Professor Lovering has pointed out how obscure and uncertain the ideas of scientific men about this ether are, in his interesting Presidential Address before the American Association at Hartford, 1874. Silliman’s Journal, October 1874, p. 297. Philosophical Magazine, vol. xlviii. p. 493.

Novum Organum, bk. ii. Aphorisms, 24, 25.

Ibid. Aph. 28.

Philosophical Transactions (1856) vol. cxlvi. p. 246.

Philosophical Magazine, 4th Series, January 1870, vol. xxxix. p. 2.

Novum Organum, bk. ii. Aphorism 25.

Faraday’s Experimental Researches in Chemistry and Physics, p. 93.

Memorabilia, iv. 7.

Experimental Researches in Electricity, Series xii. vol. i. p. 420.

Life of Faraday, vol. ii. p. 7.

Nature, vol. ii. p. 278.

Journal of the Chemical Society, vol. viii. p. 51.

Correlation of Physical Forces, 3rd edit. p. 184.

Philosophical Magazine, 4th Series, vol. xlii. p. 451.