466 
EXTRACTS — FLORIC V LTURE. 
extreme end of the shoot may be lowered, and the buds on it will also break. 
To study the variation in the heat of the glazed surface of a hot-house caused 
by radiation, is a subject worthy our attention, for although, it appears that the 
uppermost surface is coldest in mid-winter, yet an effect directly the contrary is 
produced as the season advances, and a practice, contrary to the one now stated, 
is required, which can only be conveniently and effectually obtained by the use 
of a moveable trellis, fixed at its lower part, but capable of elevation at its upper 
end. This would not only secure by its use in the dreary months of winter, a 
good breaking of the vine at an early season, but it would give an advantage 
above the fixed trellis in other particulars, especially in the prevention of a 
disease common to grapes on their approaching a state of maturity. For what¬ 
ever conclusion experience may end in, as to the cause of the disease, it is certain 
that the rays of the sun, falling upon condensed vapour, produce an air not very 
fit for a delicate and loaded plant to live and to flourish in : but as Mr. Judd ex¬ 
presses it, one that is calculated to produce an effect equal to scalding, in conse¬ 
quence of wflich the fruit becomes deformed, and ceases to acquire that state of 
perfection it otherwise would. But suppose the rays of the sun should raise the 
thermometer in a hot-house to 90 degs.; and that with all the air that can be 
admitted, it rises still higher, say to 95 degs., at ten inches from the glass, it 
would be considerably increased, say 10 degs.; while, at a similar distance, or 
one foot lower, it will be found to have increased very little. Consequently, by 
the use of the moveable trellis, we should have an opportunity of lowering the 
vine, and thereby placing it in a more temperate atmosphere, of from 5 to 6, 7, 
or 8 degrees.—J. Smith. — Trans. Hort. Soc. 
FLORICULTURAL INTELLIGENCE. 
New and Rare Plants, Figured in the Botanical Periodicals for September. 
CLASS I.—DICOTYLEDONOUS PLANTS OR EXOGENES. 
polemoniacEjE. —The Greek Valerian Tribe. 
Collo'mia laterFtia, Red flowered Collomia. A little hardy annual, bear¬ 
ing some resemblance to the C. linearis, but with darker flowers. It is a native 
of Chili, where it was introduced by Mr. Hugh Cuming. It has diminutive flowers 
of no particular beauty, its seeds ripen freely and come up spontaneously in the 
open border.— Sw. FI. Gard. 
legumin'osa. —The Pea Tribe. 
Astra'galus procu'mbens, —Procumbent Milk Vetch. A plant of rather 
delicate appearance, raised by Mr. Cameron, from Chilian seeds. It is found in 
the plains of Conception, Valparaiso, and Coquimbo, and will probably always 
require the protection of a green-house, or of a frame.— Bot. Mag. 
Astraga'lus vesica'rius, —Bladdered Milk Vetch. This very handsome and 
highly desirable species of Astragalus is a native of the barren wastes, in the south 
of France and Russia, as well as of Hungary, and is perfectly hardy, flowering in 
May. Although, as cultivated in the Glasgow Botanic Garden from seeds com¬ 
municated by Mr. Otto of Berlin, the flowers are always of a rich purple colour, 
becoming darker and almost blue in age, yet they appear, in a wild state, to be 
sometimes cream coloured or white.— Bot. Mag. 
