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by trees in the shape of rain, dew, snow, and hoar-frost, which is evaporated before reaching the ground, and the water withdrawn from the earth by the organs of trees, are together greater than the additional evaporation from the surface that is induced by removing the trees.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 31/2 inches; in February 53/4; in March 31/4; in April 21/2; 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 lessens considerably the danger to buildings. An old gentleman, a man of observation, told me that he never knew of a decayed tree that had been struck with lightning. This information is the more worthy of observation, as great quantities of withered trees are found amongst the woods, and as the greater part of the lands of the western country are cleared by deadening the timber, and allowing it to stand till it is easily burnt, or falls by decay. Another person, who is well acquainted with the habits of the Indians, informed me, that during thunder storms, these people take shelter under beech trees, in preference to other kinds of timber. Some comparative experiments on the conducting properties of leaves, bark, and timber, are necessary before the propriety of this practice can be established.
It would be difficult to form a conception of any thing in meteorology, more sublime than the aerial lightning of this climate. In dark nights the phenomenon is highly entertaining to every spectator to whom the appearance is new. The vivid flashes seem to emanate from a point, and diverge from thence in every possible direction. The eye has scarcely time to trace the progress of these coruscations, which seem to sweep round half the expanse of the heavens almost in an instant, and to irradiate {219} the margins of the blackest clouds with a transitory blaze.
I have never seen the aurora borealis in America. Two instances of its appearing in 1814 are mentioned in the Picture of Cincinnati, which are supposed to be the only unequivocal ones observed since the settlement of the western country. This meteor is more frequently seen by the people of the northern States.
The most prominent characteristics of the climate of this country are, the superior transparency of the air in clear weather; the frequency of a light yellow, but translucent tinge that is strongest at the horizon, and fainter upwards, where it is blended with a sky of a fine light blue, at the height of a few degrees. The number of foggy days is small,[122] and the appearance of clouds, previous to rain, sudden. Indeed, on several occasions, I have observed a clear atmosphere transformed into one abounding with dark clouds and rain, in the space of an hour. Changes of this kind are no doubt produced by sudden transitions of temperature.
Severe gales of wind do not appear prevalent in western America, if the two last winters can be admitted as sufficient examples, as these seasons were much less stormy than those of Scotland. But it is necessary to make an exception of the tornadoes, which occasionally blow down houses, lay waste fields, and open avenues through the woods. One of these tempests destroyed some {220} buildings at Cincinnati, on the 28th of May, 1809. It was preceded by a wind from the south, and a higher current blowing from the west, and was understood to commence in the State of Tennessee. It crossed the Allegany mountains “and made its exit from the continent” on the same day.[123]
Although earthquakes have been frequently felt in the United States, the injury done by them has either been local, or of little consequence. On the 16th of December, 1811, a concussion at Cincinnati threw down some chimney tops, opened room doors that were shut by a falling latch, and caused the furniture to shake. During the year 1812, two considerable shocks, and many lesser vibrations were observed.[124] It appeared that the centre from which the convulsions proceeded, was in the neighbourhood of New Madrid, which lies on the bank of the Mississippi, about seventy miles below the mouth of the Ohio.[125] At that place a dreadful commotion prevailed in December, 1812. The trees beat upon one another, and were either twisted or broken. The site of the town subsided about eight feet. Many acres of land sunk, and were overflowed by the river, and the water rushed in torrents from crevices opened in the land. Boats were sunk, and, (as if the order of nature had been inverted) sunk logs of timber were raised from the bottom in such quantities that almost covered the surface of the river. Slight vibrations, at intervals of a few days, continue to the present time. Many of the people deserted their possessions, and retired to the Missouri, where lands were granted to them by Congress. The inhabitants who remained, and others who have since joined the {221} settlement, are now so accustomed to the tremor, that they talk of it with little or no concern.
Last summer (1819) was unusually dry. The Ohio was not navigable for steam-boats, subsequent to the middle of April, and there was no flood till February last. West India produce, viz. coffee and sugar, became scarce, and sold at more than twice the common price. Many of the people in this land of plenty, seemed to look forward to a privation of these articles, as to an approaching famine—Apropos of coffee, as I have heard that the grocers of your country are not allowed to sell burnt beans as a substitute, it is fortunate for the revenue, that the Atlantic is always navigable.
Since coming here, a numerous meeting of citizens was held, to take into consideration the case of a Judge who occupied another public situation at the time of his being placed on the bench. Appointments of this kind are contrary to the constitution.