On the Calculation of Empirical Formulæ. The Messenger of Mathematics, New Series, No. 17, 1872.

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

Quarterly Journal of the Chemical Society, vol. viii. p. 15.

Results of Observations at the Cape of Good Hope, p. 293.

Jamin, Cours de Physique, vol. ii. p. 138.

Preliminary Discourse, &c., p. 152.

Tyndall, On Cometary Theory, Philosophical Magazine, April 1869. 4th Series, vol. xxxvii. p. 243.

See Philosophical Transactions, abridged by Lowthorp. 4th edit. vol. i. p. 130. I find that opinions similar to those in the text have been briefly expressed by De Morgan in his remarkable preface to From Matter to Spirit, by C.D., pp. xxi. xxii.

Horrocks, Opera Posthuma (1673), p. 276.

Young’s Works, vol. i. p. 593.

Boyle’s Physical Examen, p. 84.

Young’s Works, vol. i. p. 415.

Familiar Lectures on Scientific Subjects, p. 282.

Young’s Works, vol. i. p. 417.

Principia, bk. iii. Prop. 43. General Scholium.