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
