[368] First Principles, 3rd edit. chap. x. p. 253.
[369] Laplace, System of the World, vol. i. pp. 50, 54, &c.
[370] Herschel’s Outlines of Astronomy, 4th edit. pp. 555–557.
[371] Humboldt’s Cosmos (Bohn), vol. iii. p. 229.
[372] Encyclopædia Metropolitana, art. Sound, § 323; Outlines of Astronomy, 4th edit., § 650. pp. 410, 487–88; Meteorology, Encyclopædia Britannica, Reprint, p. 197.
[373] Philosophical Transactions, (1739), vol. xli. p. 126.
[374] Principia, bk. iii. Prop. 15.
[375] Lockyer’s Lessons in Elementary Astronomy, p. 301.
[376] Treatise on Natural Philosophy, vol. i. pp. 337, &c.
[377] An Introduction to Natural Philosophy, 3rd edit. 1733, p. 5.