By J. R. Partington
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44 DAVY bringing it artificially into a state similar to the other, so it m ay be increased b y exalting its natural energy. ’ Electrification arises by contact of metal plates more readily in a dry atmo sphere than in a moist one, although in the first there is no apparent chemical action and a pronounced one in the second. In the cell: dilute nitric acid, zinc, and copper, the side of the zinc exposed to the acid is positive, but in the cell: zinc, water, and dilute nitric acid, the surface exposed to the acid is negative, although the chemical action is the same in both cases.
In ethereal substances the particles move round their own axes and also move in straight lines through space. Davy’s theory of rotating atoms (see Lomonosov, Vol. I ll, p. ® In 1800* Davy said: ‘I beg to be considered as a sceptic with regard to my own particular theory of the combinations of light, and theories of light in general. ’ But in his last work (X, in XI, ix, 331) he returned to his old abandoned theory. ® Nitrous Oxide In his work on the respiration of gases in Bristol Davy (see p. 30) particu larly investigated the gas he first named nitrous oxide (NjO).
V II . (a) On the Safety Lamp for Coal Miners, with some Researches on Flame, 1818 (pp. ); in X I , 1840, vi. V I I I . S ix Discourses delivered before the Royal Society at their Anniversary Meetings, on the Award o f the Royal and Copley M edals; preceded by an Address to the Society on the Progress and Prospects o f Science, 1827; in X I , 1840, vii. IX . Salmortia, or Days o f Fly-Fishing; in a Series o f Conversations: With some account o f the Habits of Fishes belonging to the Genus Salmo, 1828, 2 ed.
A History of Chemistry by J. R. Partington