WE are informed that there is an interesting reference by the late Prof. Meehan, of Philadelphia, to a weeping form of Ulmus americana in Proc. Acad. Nat. Sci. Philad., 1901, p. 356. Like Mr. Shrubsole, however, Prof. Meehan confines himself to describing facts; he does not give any explanation of them.—ED., NATURE.