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CONCERNING FOGS,

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CONCERNING FOGS, Dr. Marcet, President of the Meteorological Society, lectured at the Institute of Civil Engineers the otbei night, upon" Fogs." Fogs in general are composed of moist vapour held in suspension in the air. But London fogs, according to Professor Tyndall, have an advantage over other fogs, inasmuch as the particles composing them have a covering of coal smoke. The lecturer gave an interesting account of the causes of London fogs. London lieq in a valley partially surrounded by hills. The air upon these hills, being colder than that in the valley, is also heaver, and therefore naturally descends to the lower level, where it condenses, rendering visible and otherwise perceptible the moist vapour of the Thames valley. During one of the recent fogs it was found that the air in London was IS grains to the cubic foot heavier than air on Wimbledon Common. Fog prevents loss of heat from the soil by radiation, which leads us to infer that London durmg the winter is much warmer than it would be in the absence of fog. At, the same time, the fog has a capacity tor the accumulation of three times as much carbonic acid gas as usual, and this no ventilation can get rid of. The lecture was well illustrated by oxyhydrogen lantern views, and the reporter's views upon fogs were so much enlarged that he says he shall always in future have a kindly feeling for them.

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