Under this head, a valuable paper by Prof. Beal is contributed to the May number of the American Naturalist. Representations of a great number of hairs are given, many species having forms, in many respects, peculiar to themselves. As to the uses of hair and hair-like glands, Prof. Beal asks, " May not these glands also draw nourishment from the particles of dust which fall on them from the ground?" and he refers to Mr. Darwin's experiments to prove, that "some of these plants (Tomatoes, Tobacco, Petunia, and many others) do certainly absorb and appropriate gaseous and liquid bodies".

Prof. Beal believes that there is a great mass of useful knowledge yet to be obtained from a study of these appendages.