ery, is but two feet above the border;
thus giving nearly the whole length of cane for fruiting upon the
rafter. Side lights are dispensed with bottom ventilation being afforded
by apertures through the brick wall, closed by shutters. The wall is
supported on stone lintels, resting on brick piers placed about five
feet apart, extending to the bottom of the border, allowing free access
for the vine roots to the outside. Ventilation at the top is effected by
means of sashes, hung in the roof at the ridge, which are raised and
lowered by an iron shaft running the length of the building, with elbow
attachments at each ventilator. A cord and lever at one end, works the
shaft, raising the whole of the ventilators at one operation. This is by
far the best method of ventilation, but more expensive than that
generally used. It is strong, effective, rarely requires repair, and the
sashes are never in danger of being blown open and broken by high winds.
The floor level of the Green-house is two feet below that of the
Grapery, in order that there may be sufficient height at the sides, to
place plants on the tables, and bring them near the glass. General
collections of plants cannot well be grown in one house; for this
reason, we have the house divided by a glass partition. By an
arrangement of valves in the hot water pipes, and independent
ventilation, a different temperature can be maintained in each. Plants
requiring a considerable degree of heat will find a congenial location
in the central house, while those in bloom, and others to which a cooler
atmosphere is more suitable, will be placed at the circular end of the
building.

Three rows of heating pipe run around the Green-houses, which will give
ample heat in the coldest weather. A propagating table is provided by
enclosing a portion of the pipes in the central house. Beneath the floor
is a cistern of 3,000 gallons capacity, from which tanks holding 100
gallons each are supplied by pumps. The Green-houses are entered through
a door and porch on the south, not shown in the engraving, also through
potting room and Grapery. The design of these houses gives an
opportunity for further addition if desired, by a wing on the south,
corresponding with the Grapery on the north. Such an extension would
improve the architectural appearance of the whole. An early Grapery
might be thus located and be heated from the same boiler. These houses,
lately designed and erected by us for John L. R