Synopses & Reviews
Synopsis
Excerpt from The Fermenting Power of Pure Yeasts, and Some Associated Fungi
This ventilating apparatus not only permits the gas to escape, but makes it possible to observe the activities going on within the flask and also protects the medium from contamination by air. The growth of the yeast is noted by the rate of passage of gas through the con trol liquid, which should be 5 to 10 per cent sulphuric acid. This de vice, when the control liquid is in place, makes it impossible for geri to enter if, by change of temperature, air should be drawn into the bottle or flask. It also renders evaporation of the culture medium impossible to any appreciable degree during the short period of the test.
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