Abstract

It has been found that many aerobic organisms isolated from the deposits of Lake Mendota as well as many commonly known bacterial species are capable of precipitating calcium carbonate under artificial conditions. Some evidence is presented that certain of than will precipitate the carbonate from solutions carrying the same amount of calcium as does lake water. Chemical and X-ray analyses have proven these crystals to be calcite which is the form of carbonate found in the deep muds of Lake Mendota. The results of two experiments, however, have failed to prove the connection of the activity of microorganisms and the precipitation of calcium carbonate within the deposits of Lake Mendota.

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