82 
GARDEN ARCHITECTURE, 
eight in each ; and we recommend that they be set very close to the edge of the 
pot, in order to increase the development of roots, and to admit of the second 
removal of every plant to pot with as great a quantity of mould as possible. This 
may be effected by cutting the soil from the circumference to the centre, exactly in 
the middle of the space between each plant, which will liberate an angular piece of 
soil, having a curved side, and in this the plant will be firmly fixed: thus no check 
will be .experienced. The soil that produces the darkest, rich verdure, and the 
greatest expansion of foliage, appears to be a compost of sandy heath mould, three- 
parts of rich unctuous loam, and of perfectly reduced black leaf-mould, each one- 
sixth part, thus together constituting another fourth part of the whole. The mix- 
ture should be as complete as possible, and in this soft and genial medium the 
growth of the plant, from the seed to its period of flowering, may be established 
and perfected. 
The flowers are usually produced singly, but occasionally two are supported on 
one stalk, but then, one of them is of diminished size. They are rather fugacious, 
being suddenly projected from the calyx, as if by the action of a spring. They 
remain perfect for some days, and may be dried and preserved of a pretty good 
colour. 
Before the flowers expand, and from their first emergence in the bosom of the 
closely scaled leaves, the footstalk takes one curve, exactly like that of a French 
horn, at the summit under the calyx, but this curve is lost as the flower approaches 
to expansion. 
The fertile stamens are two only, but there are rudiments of two others : hence, 
with the labiate form of the corolla, the plant first found itself among the Didy- 
namous families, from which, however, it was finally removed. 
The treatment is very simple ; it requires a moderate stove heat (forty-five to 
fifty-five degrees) in winter, but will blow very well in the greenhouse, or window 
of a sitting room, during the warm months. Water should be given so as to 
maintain a regular free state of the soil ; but a great quantity is not required. 
GARDEN ARCHITECTURE. 
ON THE VARIOUS FORMS AND CHARACTERS OF ARBOURS AS OBJECTS OF USE OR 
ORNAMENT, EITHER, IN GARDEN OR WILD SCENERY. 
BY R. MALLET, ESQ. OF DUBLIN. 
An arbour is a space covered and enclosed by the interweaving branches of 
trees, and reticulated stems of climbing plants, generally but not necessarily situated 
in the midst of garden scenery, and intended to afford shade and retirement. 
The words arbour and bower are, properly, very distinct ; the former alone desig- 
nating the subject of the present article; and the latter, which is not derived from 
