We find this plant does well grown in pots with rough fibrous peat or fibrous loam mixed with some leaf soil, and good drainage. It requires a moderate supply of water during the growing and flowering season. In fact, these plants may be said to be always growing and blooming, so that they should always be kept moist at the roots, as they have no succulent pseudobulbs to support them. We grow this plant at the cool end of the East India house with other Cypripediums, but it will thrive well in any ordinary stove. It is propagated by dividing the plant when there are several growths; this operation we find it best to perform just as the new growths begin to appear. Odontoglossum sceptrum.—We feel great pleasure in acknowledging the receipt of a very fine spike of _Odontoglossum sceptrum_, from the collection of W. McDonald, Esq., Woodlands, Perth. The panicle was eighteen inches in length, and bore seventeen perfectly formed flowers. It must have been cut from a well grown specimen. The sepals were large, of a deep chocolate-brown, streaked and margined with yellow; the petals were irregularly lobed at the edge, yellow, blotched with the same colour as the sepals; and the lip was yellow with chocolate-brown on the front part. This is a fine cool-house Orchid, and a native of New Grenada.—B. S. W. [Illustration: PL. 137. ONCIDIUM TIGRINUM.] ONCIDIUM TIGRINUM. [Plate 137.] Native of Mexico. Epiphytal. _Pseudobulbs_ ovate, compressed, blunt-edged, two or three-leaved, three inches in length. _Leaves_ oblong-lanceolate acute, leathery in texture, folded and sheathing at the base. _Scape_ radical, two feet long, bearing a panicle of numerous showy blossoms. _Flowers_ distinct in character from the marked contrast presented between the small tiger-striped sepals and petals, and the ample bright yellow lip, having a delicious odour of violets; _sepals_ linear-oblong acute, wavy and revolute at the margins, the lateral ones curving upwards laterally, so that they all stand above the base of the lip, the colour yellowish green, heavily blotched with transverse bands of dark chestnut-brown; _petals_ similar to the sepals in form and colour, curving upwards laterally like the lateral sepals; _lip_ three-lobed, of a pure chrome yellow, paler on the outer side; the lateral lobes oblong with rounded angles, almost semicircular, entire, flat; the middle lobe large, about an inch in depth, and one and three-quarters inch in breadth, transversely oblong-reniform, emarginate, apiculate, with a distinct basal isthmus on which is seated a furrowed ridge or crest, one-eighth of an inch high, having a three-lobed tubercle in front. _Column_ short, yellow, with two lateral oblong hatchet-shaped wings.