[footnote] *Regarding the conditions of electricity from evaporation at
high temperatures, see Peltier, in the 'Annales de Chimie', t. lxxv., p. 330.
[footnote] **Pouillet, in the 'Annales de Chimie', t. xxxv., p. 405.
[footnote] ***De la Rive, in his admirable 'Essai Historique sur
l'Electricite', p. 140.
[footnote] ****Peltier, in the 'Comptes Rendus de l'Acad. des Sciences', t.
xii., p. 307; Becquerel, 'Traite de l'Electricite et du Magnetisme', t. iv.,
p. 107.
Limiting itself to results yielded by electrometric observations, such, for
instance, as are furnished by the ingenious electro-magnetic apparatus first
proposed by Colladon, the physical description of the universe should merely
notice the incontestable increase of intensity in the general positive
electricity of the atmosphere,* accompanying an increase of altitude and and
the absence of trees, its daily variations (which, according to Clark's
experiments at Dublin,
p 336
take place at more complicated periods than those found by Saussure and
myself), and its variations in the different seasons of the year, at
different distances from the equator, and in the different relations of
continental or oceanic surface.
[footnote] *Duprez, 'Sur l'Electricite de l'Air' (Bruxelles, 1844), p.
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