The plan of this pit is adapted for early or late forcing; in consequence of the construction, it is equally adapted for Winter as Summer. By the advantage of the ventilators in carrying off the condensed air, the advantage derived by the door being at the North end, we have no loss of top heat, as is too frequently the case in common framing. The dung chambers may be appropriated to forcing Seacale, Rhubarb, and Mushrooms in pots or boxes.

ARTICLE IV.

PLAN & DESCRIPTION OF A MODE OF HEATING BY HOT-WATER, As Practised at Olive-Mount, Wavertree, near Liverpool, the Seat of J. T. Crosby, Esq,

BY MR. GEORGE USHER.

THE annexed plans and description of a mode of heating by hot water, have been adopted at Wavertree, and, as far as we have gone, the system has realized every reasonable expectation, and affords a prospect of still greater advantages. I intend to send you next season, a particular account of the effect of this treatment upon pines, with such observations as a little more practice will enable me to make.

We aim at keeping the pits at 95 to 100 degrees, the houses at 70 to 75 degrees during the nights of summer, and 60 to 65 in winter. The pit pipes are kept constantly going, the house pipes at night, and when necessary turned off in the morning, but if the weather be very cold, they are also kept going constantly. The requisite degree of heat is easily obtained by regulating the damper and partly turning the cocks.

In consequence of the grate becoming choked with scoria it sometimes happens that open dampers and full circulation will not effect the desired heat; in that case tilt the door on the top of the furnace with an iron wedge, about two inches high, this will soon raise the heat to the degree required; in fact, where it is absolutely necessary to use coals, I would always have this door left a little open, as the hydrogen collecting at the top of the furnace, may explode, and rift the brickwork. Where coke is used, (which I would always recommend both for economy and cleanliness,) this can never happen, that principle being in a great measure extracted.

The value of the fuel used by us, when the pipes are all at work, is five shillings worth of coke in 21 days. The houses are 80 feet by 17 feet, and the height at back 10 feet 6 inches and in the front 6 feet 6 inches.

In the ground plan No. 1 (Fig. 33.) (a) is intended to shew two pipes upon the front walk. (b) Brackets supporting the front pipes, and iron trellising, round the house. (c) Cocks to turn the front pipes off. (d) Pipes for heating the Pine pits. (e) Cocks to tum the pit pipes off. (ƒ) Iron trellising for flower pots. (g) Return pipes for each house, coned into the connecting pipe. (h) Connecting pipe. (i) Return pipe to the coil. (k) Flow pipe from the coil. (1) A portion of the pit, covered in with boards. (m) Holes cut in

the boards, for the pine pots to rest on their rims. support the boarding and pots. (0) Sliding doors.

(n) Bearers to

No. 2 is a section across the furnace. (a) is a coil or boiler consisting of fifteen rounds of inch piping set in a descending furnace: (b) Iron door and casing upon the top of the furnace, for putting down the fuel. (c) Double door for lighting the fire and drawing out the scoria. (d) Ash-pit door. (e) Grate bars. (ƒ) Iron bridge supporting the wall which separates the fire from the coil.

No. 3 is a representation of the front of the furnace. (a) is the Ashpit door, (b) the fire door, (c) dust door, for cleansing the coil, (d) the same open, (e) the furnace top door.

No. 4 is a representation of the trellis, supported by the brackets (b) in the ground plan No. 1.

No. 5 is the elevation of the front (inside,) (a) is intended to represent six pipes against the front wall for heating the houses. (b) Openings in each alternate front light, with iron casing to admit the vines being taken in and out, by lifting up the light. (c) Short Brackets for trellising only.

No. 6 is the elevation of part of the back wall, (a) is the expansion pipe. (b) Flow pipes to pits. (c) Flow pipes to houses on each side of glass partition going over the doors to the front wall. (d) Flow pipe from the coil to the expansion pipe. (e) Brackets for supporting the back trellising. (f) Back trellising. (g) Air screw. No. 7 is a section of the House and Shed. (a) Is the expansion pipe, (see (a) No. 6). (b) Flow pipe. (c) Filling pipe. (d) Flow pipes for each house. (e) Flow pipes for each pit. (f) Pit pipes. (9) Cock for pits: (h) Return pipes for pits and houses. [i] Connecting pipe. [k] Dust door for cleansing the back of the coil. [1] Six front pipes. (m) Brackets supporting front pipes and trellising. [n] Brackets supporting the back trellising. [o] Damper.

No. 8, shows the lights on the roof [a] is the bottom sheet and [b] the top sheet.

The small scale is for Nos. 1, 5, 6, 7, 8, and the large one for No. 2, 3, 4.

FLORICULTURE.

ARTICLE V.-NEW AND RARE PLANTS,

FIGURED IN THE PERIODICALS FOR OCTOBer.

CLASS I-PLANTS HAVING TWO COTYLEDONES OR SEED-LEAVES.

LEGUMINOSE, the Pea Tribe.

LUPINUS NANUS, Dwarf Lupine.-The flowers of this beautiful Lupine are azure blue, purple, and white. Mr. David Douglas found the plant in California, and introduced it to the garden of the Horticultural Society, whence seeds have been distributed to various collections. It is a hardy annual, thriving in any light soil, and is found to produce seeds freely.-Don. Brit. Fl. Gard.

ACACIA BREVIPES, Short pedicelled Acacia.-This species has been cultivated at the Royal Gardens, at Kew, for upwards of twenty years. It is said to be a native of New South Wales. It is a hardy conservatory plant,-Curt. Bot. Mag.

ERICEE.

RHODODENDRON FERRUGINEUM album, White flowered rustyleaved Rosebay.-A very dwarf shrub scarcely more than a foot high, with pure white flowers. It is very rare, and was probably originally obtained from the Pyrenees, when, according to the accurate Bauhin, this variety is frequently found.-Don. Brit. Fl. Gard.

AZALEA DANIELSIANA, Mr. Captain Daniel's Chinese Azalea.— This plant, like most of its congeners, thrives well in rough sandy peat earth, the pots being well drained, kept in a dry airy part of the greenhouse in winter, and then not over-watered. If placed in moist heat, previous to flowering, there is caused a more perfect bloom. It is probable that it may be propagated, like the other Chinese species, viz. by cuttings and layers. It is generally admitted, that the empire of China has furnished to Europe, more splendid flowering plants than any other portion of the globe; whether we view the various species collected in an indigenous state in that extensive empire, or the more generally cultivated and selected objects from the celebrated gardens of Fa-te, near Canton, where every plant worthy of cultivation is to be obtained. Captain Daniels, of the Honourable East India Company's Service, brought home several cases of rare plants, for Mr. Tate, of Sloane-Street, in 1830, among which were the double red and variegated Chinese Azaleas. The flowers of the A. Danielsiana are large, and of a bright scarlet colour. We have pleasure in stating, that from Tate's successful