Air Plants, a term applied to some species of the families of Bromeliaceae (Tillandsia us-neo'ides, hanging in festoons from the forest trees of tropical America, moss-like, and T. xiphioides, perfuming the balconies of houses in Buenos Ayres, &c), and of orchidacecae (namely, the parasitic groups of them, such as the aerides, arachnides, or flos aera of the East Indies, and many others), because of their being able to live for a considerable time, suspended in the air, without apparently receiving any nutriment. The hot, damp, and shady forests of the torrid zone in Asia, Africa, and America, abound in gracefully and grotesquely shaped and deliciously scented species of or-chidece, so that in Java alone there are nearly 300 varieties. During the dry season, which is that of repose, corresponding to our winter in this respect, these parasites wither, lose their leaves, and seem to be dead; but as soon as the gentle, preparatory rain begins to fall, they revive, and become fully developed into their glorious existence by the ceaseless showers that transform the whole surface of the country into a magnificent hothouse. They are attached, amid gigantic grasses, ferns, and numberless climbers, to trees, rocks, etc, and are nourished by the continual warm vapors that fill the forests.

Stagnant water is injurious to them, even by mere proximity. The roots of most fully developed air plants, by which they cling to their supports high in the air, have an outer parchment-like layer, in which the spiral cells exhibit detached fibres and simple walls; thus in oncidium altissimum, epidendron elongatum, etc. In order to enjoy these beautiful plants in our houses, we must surround them by the natural circumstances in which they prosper, viz.: rotten wood, a very little chopped moss, and fragments of flower pots for soil, with heat, damp air, light, absence of stagnant water and of impurities.