(American Aspen.) BoTABicAL DEeCRiPTiON. — Tbis tree, also known as the White poplar, grows from twenty to fifty feet iigh, with, a diameter of from eight to twelve inches. It is covered with a smooth, greenisli-white bark, except on the trunk of very old trees. The Uaves are orbicular-cordate, abruptly accuminate, dentate^serrate, smooth on both sides, pubescent at tlie mar- gins, dark-green, three nerved, from two to two and a half inches long, growing on long, slender, and laterally compressed petioles, which accounts for the continued agitation of the leaves by the sliglitest breeze, Aments plumed with silken hairs, about two inches long, pendulous, appearing in April, long before the leaves. Scales cut into three or four deep linear divisions, and fringed with long hairs. Officinal Prbpabatiobs. — Tincture of the inner bark and leaves with strong alcohol; dilutions; Popaijii and its triturations. Analogces. — Arniea, Ohina, Oorrmi fiorida. Nun vomica, F-ulsatilla, Terebinlhina (?) Thuja. (A Fragmentary proiting.)