The growth of dew formed on a glass-surface cooled by a freezing mixture was examined under varying conditions, the main results of which are as follows.
1. The does not appear if the cooling surface is confined within a small box.
2. When the surrounding air is colder than the glass surface, the dew does not form on it though the fog becomes conspicuously visible in the air.
3. The derv formation does not seemingly enhance the evaporation from the water vessel placed near the glass surface. But when the circulation of a weak air current sets in and brings the moist air above the cooling surface, the dew is observed to deposit and causes water to evaporate to a greater extent.
4. Though the cooling rate is kept the same, the enclosed glass surface always shows lower temprature than the open one and varies very little. It is however a remarkable fact that the dew forms on the former surface in very small quantity compared with the latter.
