The Arboretum, at the Agricultural Grounds at Washington, just now is very interesting, the many hun-Ireds of trees and shrubs being in nearly full foliage. Farmers who wish to identify or find a name for any new or curious tree or shrub, which they happen to find on their farms, can do so by a walk in the Arboretum. Those designing to ornament their lanes and grounds can here see every sort known in this zone; and artists who wish to delineate any particular foliage can here, find every specimen. - Fruit and Floral Magazine.