Abstract
PERIODICALLY, cultures of coliform organisms in simple synthetic medium (glucose–phosphate–ammonium salt) have failed to grow when aerated in this laboratory, contrary to experience in other towns. This culminated in a few weeks when such cultures refused to grow at all, so that the possible presence of poisons in the air was suspected. Consequently the air intake of the compressor was placed outside the laboratory buildings. The phenomenon persisted during the daylight hours but was eliminated at night time.
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