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Show Influence of Forests Proved by Experiment Forests influence the amount of moisture In the air as well as conserve con-serve the water in the ground. Humidity Hu-midity records taken by the racitic Northwest forest experiment station in a Douglas fir forest before and after the trees were cut indicated a remarkable difference in atmospheric humidity, according to the forest service, United States Department of Agriculture. ' In the forested area the relative humidity fell below 35 per cent in only one-third as many hours as In an open area nearby. After the forested for-ested tract was cut over, the atmosphere atmos-phere above it appeared to become almost as dry as that over the open space. The tests showed that the removal re-moval of f he trees increased the number of hours during which the humidity was below 35 per cent by two and "Kie-half times. |