into the Flues CCC; the Flues at the back of the Wall are two Foot over, and as much in height: When they come to turn at the Corners they are reduc'd to a Foot wide, and rife gently to convey the Draught of Smoak and Heat into the Flue C, which runs in the Front of the Niches, to be carry'd up the Chimney D. On the Top of this Front Flue arc set the Pannels of Glafs, which flope gently towards the Top of the Wall, where they meet a Coping; in the middle of every Nich a Vine fhould be planted to be order'd, as I fhall direct hereafter.

Fig. II. is the Upright of the fame Wall, made to front the South Sun, which must be obferv'd in all the other Walls built for this Purpose.

Fig. III. is the Ground Plat of a Wall built in Niches, in the Figure of half an Hexagon, each Nich eight Foot over AAAA. At the Back of the firft Nich is an Oven or Fire-place three or four Foot fquare, mark'd B. opening into a Flue B. of two Foot high, and a Foot and half over, reaching about two Foot and half high in the Wall: At the end of this Flue, where it enters the Chimney, about four Foot high of the Wall, is another Oven or Fire-place as large as the former, mark'd C, which opens into a Flue C, which is of the fame Dimenfion of the Flue B, and runs over or above, and parallel with it.

This Front is glaz'd and planted like the former; the Niches of both are very proper for preferving Cabbage-Lettuce in the Winter, and for young Salads; when the Fires begin to work, we may likewise put in Kidney-Beans, or fome

dwarf

dwarf Peafe; but I shall fay more of these Things. in another Place.

The next Stove or Confervatory I shall take Notice of, is, that lately built by Mr. Fairchild at Hoxton, which is contriv'd for feveral good Ufes; and among others, I am of Opinion, it will bring the Ananas or Pine-Apple to bear Fruit; it is ten or twelve Foot wide from the Front Glaffes to the Back Wall, and about for ty Foot in Length; the front Frames to which the Glaffes are hing'd, lie floping to the Back in fuch a manner, as to drop about a Foot from an Upright, and the Roof or Cieling is higher in the Front about a Foot than it is at the back Wall; the Fire-place or Oven is about three Foot fquare, mark'd A. Fig. IV. About a Foot high this Oven opens into three Flues mark'd BBB, running parallel to one another to C, the whole Length of the House. At C they are all refolv'd into one Flue, which in the Breadth of the Houfe to D rifes about three Foot higher, and then runs through a Flue E to the Chimney F, which gives a Draught to the whole, and a due Degree of Heat every where.

The Flue È is cover'd with fquare Tiles, and is the uppermoft of four Steps for the standing of Pots: Between the Steps and the front Flues BBB is a Walk about three Foot wide, laid with Sand, which preferves an Heat when the Fire is out.

The three Flues mark'd B B B are cover'd with fquare Tiles, fo difpos'd, that a Bed of Sand of a Foot thick may lie upon them, into which fome Pots with the moft tender Plants are to be fet; and fuch a Sand Heat is accounted the most conftant of any other, and may be regulated to

any

any Degree of Heat, by adding or taking away of Sand:

Over the Fire-place A are three Pipes of Earth, about three Inches each in the Bore, which being heated, let into the Confervatory an Air duly warm, and prevent the Damps and Stagnation of Air in the Houfe; and near the fame Fire-place is plac'd an earthen Pipe, which conveys hot Air at Difcretion into a Glafs Frame mark'd HHHH by G, which is the Front Wall of the Confervatory I have been defcribing : This Front Wall is about two Foot high, upon which the great Glafs Frames of the Confervatory are refted. This Wall mark'd GG is heated by the Fire in the Flues, and is contriv'd fo as to make the Back of the Frames mark'd HH, communicate a gentle Warmth to them.

Against this Wall from G to G are to be planted fome of the common May Cherries, which are flow Growers; and though the Wall may not be in the Clear above twenty Inches high from the Surface of the Bed, yet by leading the Shoots of fuch Trees horizontally, the Trees will have full Room enough to grow and bear Fruit.

Upon the Bed, or in the Frame mark'd HHHH and III, may be planted Tulips, Narciffus, Jonquils, Hyacinths, and towards the Front, which is the fhalloweft Part, Crocus's and Winter Aconites, to come in December. The Bed HH, &c. will bring its Flowers perhaps a Month fooner than that mark'd III, proportionable to the Distance from the Fire-place. At the End of the Bed mark'd II, &c. is an earthen Pipe to let warm Air out of the Confervatory into the little Frame, in cafe of extraordinary Froft. The Figures, 1, 2, 3, are so many Steps

Steps cover'd with fquare Tiles without Flues under them, for the Pots of lefs tender exotick Plants; fuch as Aloes, and others, which come from Places from twenty five to thirty five Degrees Latitude: But the Bed of Sand BBB will be hot enough for Plants from twenty five Degrees Latitude to the Line. The Door Way is at K, which opens from another House into the Confervatory; fo that the Air which enters it upon opening the Door is never over cool, but is foften'd by the Warmth of the Fire-place. An House of this kind may be divided by a Partition of Glass; for any thing less transparent would occafion too great a Shade in both Divifions, at the very Seasons when the Sun's Presence is most neceffary.

The Ufe of the Partition is, that we may give Air to the Plants in one Division, when we give none to the other; for the Plants in one Thould be only fuch as come from Places of Northern Latitude, and the others of South Latitude, which always have different Seafons of Growth, as their natural Spring happens either in this or the other fide the Line; and we ought to humour our Plants, and encourage their shooting, only at fuch Times as it is natural for them to grow.

In fome Stoves or Confervatories, the Fireplace is a kind of Oven cover'd with Plates of Caft-Iron, fo that the Space of the Oven is about ten Foot in Length, and five in Breadth, and the Flue leading from it runs parallel with the Back of the House, and then taking a Turn runs along the Front, juft within the Glaffes, ending in a Chimney that paffes through the End-wall: This Flue is about fourteen Inches wide, and about eighteen in Depth, and is cover'd

3

ver'd with Iron Plates of about two Foot in Length: Over the whole is laid a Covering of Sand of three or four Inches thick, and upon that a Pavement of fquare Tiles. A Stove or Confervatory thus prepar'd for giving Heat, may be about fifty Foot in Length, ten Foot wide, and ten Foot high in the back Wall from the Floor, and should always have a Door or two opening into fome other House or Room to let in regulated or corrected Air, when the Heat is too intense; for Air may be too much rarified or refin'd by Heat for a Plant to live in, as it may be for an Animal to live in. For want of this Caution, I have known Plants have chang'd their healthful Verdure for 'a pale, sickly Colour, which has ended in Death; and I am perfuaded, many a Man has grown fickly for want of a due Freedom of breathing a well regulated Air, which I am fatisfy'd may be render'd more or lefs agreeable to our Conftitutions by Art.

The Fires to be us'd in these Stoves or Furnaces are either Wood, Coal, Turf, or Peat.

The firft is fudden and unconftant, affording a much hotter Smoak than either of the others, and therefore is the best for warming the Walls, for forwarding of Grapes and other Fruits, where the Flues are of great Length.

The Coal yields a more lafting Heat, and affords a Smoak of a moderate Warmth, and may do well enough to warm Flues of a moderate Length: But Turf or Peat, fuch as they burn in Holland, gives us a conftant equal Heat, and yields no perceptible Smoak; it warms the Air in the Flues, and never disturbs Plants; and where this is burnt, there must always be a much larger Oven to gather a Fund of Heat

than