Publisher's Synopsis
Excerpt from The Natural History of Aquatic Insects
The conditions of life in fresh waters are materi ally different from those afforded by the sea. The chemical difference between fresh and salt waters is of small importance in itself - so small that many animals have been able to adapt themselves gradually to a change from one to the other. A degree of saltness far greater than that of sea-water is perfectly compatible with animal life, as is shown by the fact that Crustacea and Insects are often found quite at home in brine-pits and vats. There are even a few animals, like the Salmon, which can pass sud denly from fresh water to salt, or from salt to fresh.
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