GARDEN ARCHITECTURE, 
255 
is solely fit for the species of limited growth ; and that these must be perseveringly 
deprived of shoots that would wander beyond a given circle, as well for the elicita- 
tion of short flowering shoots, as for the retention of the whole within a prescribed 
radius. 
Such trellises may be affixed to a short, central rod, driven into the soil in the 
middle of the pot ; or, as it is better to avoid thrusting stakes among the roots of 
plants, on account of the injury they sometimes occasion, the outer edge of the 
trelHs can be brought below the top of the pot, and fastened, by strong wires, to a 
ring of similar strength surrounding the pot. Kennedya prostrata^ Z'lchja coccinea, 
Gompholohium polymorphum^ and several allied plants of the same genera, as well 
as many belonging to similar tribes which are not less frequently cultivated, consti- 
tute excellent subjects for training on the trellises here recommended. 
GARDEN ARCHITECTURE. 
— ♦ — 
Hitherto, houses with plain span-roofs have exclusively occupied our atten- 
tion ; but we must at length treat of what are styled curvilinear roofs of diiFerent 
kinds, whether as belonging to circular, oval, oblong, or undefinable structures, 
and as relates to an ordinary and simple curve, or one composed of larger and 
smaller arcs, popularly known as ridges and furrows, because the exterior presents 
a series of protruding and depressed curvatures. 
Curvilinear roofs, till very recently, were almost uniformly made of iron, the 
bars for admitting the glass being throughout of the same thickness, with none of 
the stronger rafters which are requisite in a wooden erection. Hence, the advocates 
of wooden roofs — and the horticultural world has been long divided in opinion 
with respect to the greater eligibility of wood or metal for the construction of 
plant-houses — were compelled to adopt the old sloping or angular figure. Messrs. 
Loddiges' large palm stove may perhaps be considered the earliest example, on 
any noticeable scale, of the application of wood in a curved roof ; though here the 
curve is much depressed, and its breadth is trifling when compared with the height. 
Within the last few years, structures of the most extensive kind liave been 
formed at Chatsworth, in which various and very prominent curves have been 
effected in the roofs with wood. These completely prove the easy practicability 
and strength of the plan ; and their perfect success teaches, that those who prefer 
w^ooden roofs may now obtain this more elegant figure with the material of their 
choice. 
The difficulty that has heretofore beset the builder in making strong curved 
rafters of solid wood, of any considerable length and size, has been the impossibility 
of warping them, and having them, concurrently, of an adequate power to resist a 
given pressure from, without. This has been overcome by the employment of 
numerous long thin pieces of wood, cut to the required width, and, after being bent 
