Philosophical Transactions, 1801, p. 429.

Nicholson's Journal, 4to. vol. I. pp. 311, 299. 349.

Or even from thirty to forty.

Bibliothèque Universelle, 1830, tome xlv. p. 213.

Philosophical Transactions, 1831, p. 165.

Annales de Chimie, l. p. 322.

Ibid. li. p 77.

Phil, Mag. and Annals, 1832, vol. xi. p. 405.

Lond. and Edinb. Phil. Mag. and Journ., 1832, vol. i. p. 161.

Ibid. 1832. vol. i. p. 441.