Note 40 — Chapter V
Reading edition
On the Magnetic Relations of the Positive and Negative Optic Axes of Crystals, by Professor Plücker, of Bonn.—Philosophical Magazine, No. 231 (3rd Series), p. 450. Experimental Researches on Electricity; On the Crystalline Polarity of Bismuth and other bodies, and on its Relation to the Magnetic form of Force: by Michael Faraday, Esq., F.R.S.—Transactions of the Royal Society for 1848.