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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from Glaucus/The Wonders of the Shore by Charles Kingsley: his experiments verified was the same as that on which Mr. Ward, in
1842, founded his invaluable proposal for increasing the purity of
the air in large towns, by planting trees and cultivating flowers
in rooms, THAT THE ANIMAL AND VEGETABLE RESPIRATIONS MIGHT
COUNTERBALANCE EACH OTHER; the animal's blood being purified by the
oxygen given off by the plants, the plants fed by the carbonic acid
breathed out by the animals.
On the same principle, Mr. Warrington first kept, for many months,
in a vase of unchanged water, two small gold fish and a plant of
Vallisneria spiralis; and two years afterwards began a similar
experiment with sea-water, weeds, and anemones, which were, at
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