Show influence of forests proved by experiment forests influence the amount ot of moisture in the air as well as conserve the water in the ground humidity records taken by the pacific northwest forest experiment station in a douglas fir forest before and after the trees were cut indicated a remarkable viar kable difference in humidity according to the forest service united states department of agriculture ri in the forested area tile the relative humidity fell below 35 per cent in only one third as many hours as in an open area nearby after the forested tract was cut over the atmosphere above it appeared to become almost as dry ns as that over the open space the tests showed that the removal of the trees increased the number of hours during which the humidity was below 85 per cent by two and one halt half times |