= 2^3 
ODONTOGLOSSUM CITROSMUM. 
ODOXTOGLOSSTTM CITEOSMUM. 
Nat. Order .— Orchidace^e. 
'Generic Character. — Odontoglossum, Humboldt, Bonp- 
land, and Kwith. — Perigone spreading, with narrow acumi¬ 
nate, free segments, the outer and inner equal. Labellum 
clawed, continuous with the column at the base, not spurred, 
undivided, the lamina spreading, crested at the base. Column 
erect, membranously margined, winged on both sides at the apex. 
Anthers two-celled ; pollen-masses two, solid; caudicles linear, 
gland hooked.—Tropical American herbs, epiphytes, pseudo- 
bulbiferous; leaves plaited, scape terminal, sheathed, flowers 
showy.—( Endl. Gen. Plant. 1466.) 
Odontoglossum citrosmum, Bindley. Lemon-scented Odon¬ 
toglossum.—Pseudo-bulbs, sub-rotund compressed, smooth, one¬ 
leaved (?); leaves oblong-ligulate, obtuse, shorter than the ra¬ 
ceme ; sepals oblong, obtuse, and sub-equal to the conformable 
petals ; labellum clawed, uniform, bi-tuberculated at base, late¬ 
ral, sub-truncate; dorsal wings of the column roundly-toothed. 
B ESCEIPTIOX. — A very handsome, scented pseudo-bulbous epiphyte; the pseudo-bulbs 
roundish compressed and smooth, bearing one or two leaves which are oblong strap-shaped, 
shorter than the raceme, obtuse or acute, and deep green. The flowers large, borne on an elon¬ 
gated rachis, forming a showy raceme; the peduncles diverging from the racliis. The sepals 
and two lower petals nearly alike; oblong, obtuse, wavy at the margins; white or slightly tinged 
with lilac, especially beneath. Labellum with a claw, continuous with the column at the base, 
not spurred, the claw yellow with two tubercles at the base; the limb lilac orrose-coloured, 
broadly kidney-shaped and emarginate. Column erect, with a membranous margin winged at 
both sides and at the back above, lateral and dorsal wings roundly toothed; flowers lemon- 
scented. This species closely resembles an Oncidium, but its labellum has two parallel fleshy 
plates at the base, forming an acute angle with the column, which has three wings, two lateral 
and one dorsal; these characters require it to be referred to Odontoglossum. 
History, kc .—Eirst exhibited at the gardens of the Horticultural Society' in July 1842, sent 
from the garden of T. Brocklehurst, Esq., of the Fence, Hacclesfield, to whom it had been 
given by Hr. Barker. Our drawing was made from an exquisitely coloured specimen—the 
result of Hr. Hylam's judicious management—exhibited diming the past summer by S. Bucker, 
Esq., of Wandsworth. The species is a native of Hexico, and is said to have been introduced 
in 1841.—A. H. 
Culture. —“ Among the many beautiful Orchids now in cultivation this is doubtless one of the 
most lovely, especially where grown and exhibited in the style in which Hr. Fucker's successful 
gardener, Hr. Hylam, has for many years shown it; and we wonder, as it is very easily 
managed, why it is that so few fine specimens find their way to our exhibitions. Like all the Odon- 
toglossums, this species requires to be grown well to insure its blooming strongly, and the best 
soil to grow it in, and all the rest of the genus, is the soft Devonshire peat; draining the pots 
thoroughly and keeping the plants in a cool part of the house. When the plants are in good 
growing condition encourage them by every means in your power, until their growth is com¬ 
plete, when they ought to produce pseudo-bulbs three inches in diameter. The season of rest 
should be uninterrupted by excitement of any kind; and guard cautiously against drip, which 
would be very injurious to the plants.” Eor the preceding remarks we are indebted to 
Hr. Goode, a gentleman well known as having devoted considerable attention to the culture of 
Orchids.—A. 
OX THEBHOHETEB STAXDS. 
By E. J. LOWE, Esq., F.R.A.S., &c. 
r AYIXG obtained good thermometers, the next important step is to place them advantageously. 
The errors arising from a want of knowledge in this respect are very great; and, where registers are 
kept, unless the instruments are placed in similar positions to others, they cannot be compared with 
any degree of accuracy, so that it is labour in vain to record the readings of a thermometer unless 
placed on a thermometer stand. It is next to impossible that, under ordinary circumstances, two ther¬ 
mometers may be similarly placed; but, Henry Lawson, Esq., F.E.S. (of Bath), to whom we are in¬ 
debted for eminent service rendered to the cause of science, has constructed a thermometer stand which 
at once gives us uniformity in the placing of instruments ; and James Glaisher, Esq., F.E.S. (of the Eoyal 
Observatory), has invented another for the like purpose, one or other of which should be used by all 
r 
