Page:Early western travels, 1748-1846 (1907 Volume 9).djvu/250

 The older settlers of this country affirm, that the quantity of water issuing from springs is greatly augmented, by clearing away the timber from the adjoining lands. From the number and the respectability of the persons agreeing in this particular, the fact seems to be established. This is not, however, to be explained simply by evaporation from the earth, as that evaporation would be promoted by clearing away the woods, which exposes the surface of the ground to the rays of the sun. In this way the soil would absorb a less supply for springs than if it were shaded by trees. It would seem probable, that the moisture intercepted by trees in the shape of rain, dew, snow, and hoar-frost, which is evaporated before reaching the ground, and the water withdrawn from the earth by the organs of trees, are together greater than the additional evaporation from the surface that is induced by removing the trees.

In January last, the rain at Jeffersonville measured 3-1/2 inches; in February 5-3/4; in March 3-1/4; in April 2-1/2; and in May, three inches; making an aggregate of eighteen inches in five months, a quantity that is probably a little greater than the mean for any long series of years.

Thunder occurs frequently; sometimes the peals are tremendous, and almost incessant. They are generally accompanied with showers of rain, so copious {218} as to cover flat ground with a sheet of water, and the declivities with a broad stream. Many of the best houses are furnished with rods for conducting the lightning. Judging from notices of accidents from the electric fluid in the newspapers, I am not led to believe that they are much more numerous than in Britain. Although trees are bad conductors of electricity, they are frequently struck, and it seems probable that the great abundance of lofty trees