Balfour Stewart, Elementary Treatise on Heat, p. 192.

British Association, Liverpool, 1870. Report on Rainfall, p. 176.

Philosophical Magazine., Dec. 1861. 4th Series, vol. xxii. p. 421.

Experimental Researches in Electricity, vol. iii. p. 84, &c.

Lectures on Heat, p. 21.

Baily, Memoirs of the Royal Astronomical Society, vol. xiv. pp. 29, 30.

Grant, History of Physical Astronomy, p. 531.

Philosophical Transactions, abridged by Lowthorp, 4th edition, vol. i. p. 202.