[548] Discourse to the Royal Society, 28th May, 1684.

[549] Robert Hooke’s Posthumous Works, p. 365.

[550] Experimental Researches in Electricity, vol. ii. pp. 240–245.

[551] Murchison’s Silurian System, vol. ii. p. 733, &c.

[552] Philosophical Transactions (1872), vol. clxii. No. 23.

[553] Philosophical Transactions (1852), vol. cxlii. pp. 465, 548, &c.

[554] Philosophical Magazine, 4th Series, vol. i. p. 182.

[555] Maxwell, Theory of Heat, p. 123.

[556] Prior Analytics, ii. 2, 8, and elsewhere.

[557] Hofmann’s Introduction to Chemistry, p. 198.