At a recent meeting of the Academy of Natural Sci-ences of Philadelphia, Mr. Meehan commented upon a collection of leaves inserted by earth-worms in their burrows in the manner described by Darwin, who, it will be remembered, states that such leaves are drawn in by the worms either by the apex or petiole, as may present the least resistance. The collection had been made by Mr. Edward Potts, from his own grounds, and consisted of willow leaves, although peach leaves were sometimes employed in the same way. These leaves being lanceolate, or as much tapering at the one end as the other, were inserted indifferently at the petiole or at the apex. It was supposed that their use is to line the burrows, and thus protect the worms from the cold and moisture of the earth, although portions of the leaves are evidently softened by the secretions of the worms and used as food. A willow leaf will be drawn entirely into a burrow in the course of three days. The habits of earth worms as illustrated by the specimens exhibited were commented on by Messrs. Heilprin, Potts and Leidy.