I am very much interested in the subject of variability of soils, as adapted to different forest trees. Chestnuts do need light porous soil, and grow on such limestone in Chester county. But on soil, apparently equally light and dry here in Union county, they do not grow. And yet, so far as I observe, there is always a little more clay in soil here than in Chester county. And again, this soil in Union county seems the natural home of the honey locust, every waste piece of land soon becoming covered with a luxuriant growth of it; while in Chester and adjoining counties, although this tree is found, I have never seen it so much at home as here. Lewisburg, Pa.