[footnote] *Boussingault, 'Recherches sur la Composition de l'Atmosphere',
in the 'Annales de Chimie et de Physique', t. lvii., 1834, p. 171-173; and
lxxi. 1839, p. 116. According to Boussingault and Lewy, the proportion of
carbonic acid in the atmosphere at Audilly, at a distance, therefore, from
the exhalations of a city, varied only between 0.00028 and 0.00031 in volume.
[footnote] **Liebig, in his important work, entitles 'Die Organische Chemie
in ihrer Anwendung auf Agricultur und Physiologie', 1840, s. 62-72. On the
influence of atmospheric electricity in the production of nitrate of
ammonia, which, coming into contact with carbonate of lime, is changed into
carbonate of ammonia, see Boussingault's 'Economie Rurale consideree dans
ses Rapports avec la Chimie et la Meteorologie', 1844, t. ii., p. 247, 267,
and t. i., p. 84.
Some observations of Lewy render it probable that the quantity of oxygen
varies perceptibly
p 312
but slightly, over the sea and in the interior of continents, according to
local conditions or to the seasons of the year. We may easily conceive that
changes in the oxygen held in solution in the sea, produced by microscopic
animal organisms, may be attended by alterations in the strata of air in
immediate contact with it.
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