. Journal officiel de la Royal Horticultural Society de Londres. y serait de 3 pieds carrés. Quant au coût de ce genre, il ofwork peut être fait pour le 6d. un pied où minéral peut être eu pour30s. p. 1000, mais serait moins coûteux où les tuiles sont moins cher,qu'ils sont en très bon nombre de districts. La cheminée qui était Iused grand inutilement, et les briques et tuiles de l'incendie ont été utiliséspour une mesure inutile mais même alors il ne coûte £3.complète celle utilisée par mon voisin, pour une petite serre longand 20 pieds 10 pieds de large*, était le cast off cheminée d'une vieille,cuivre et est amplement suffisant pour son but. Je

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. Journal of the Royal Horticultural Society of London. y would be 3 feet square. As to the cost of this kind ofwork, it can be done for 6d. a foot where tiles can be had for30s. per thousand, but would be cheaper where tiles are cheaper, which they are in very many districts. The fire-place which Iused was needlessly large, and fire-bricks and fire-tiles were usedto an unnecessary extent • but even then it only cost £3 complete.That used by my neighbour, for a small greenhouse 20 feet longand 10 feet wide*, was the cast off fire-place of an old copper, and is amply sufficient for its purpose. I have since seen a material which seems to me very likely tomake a good and cheap floor, but it has not yet been tried. It is anartificial pavement of cement made in blocks of any size for ratherless than Gd. a foot (superficial), and with the edges so constructedas to make a thoroughly smoke-tight joint, by pouring inliquid cement after the pieces are laid in their places (as will beseen by the figure f ). This is found very durable as a pavement, . * In this house there is no external border. f It will be seen by the figure that the lower flanges of the tiles touch; theupper flanges are half an inch apart, and there is a groove in the edges, so thatthe whole forms a solid mass when the cement is poured in. WYKEHAM MAETIN—HYPOCAUST-HEATING. 18 but has not been proved as to its power of standing fire-beat, noras to the shrinking of the joints. The next point to be consideredis the cost of fuel, the cheapness of the construction being abun-dantly plain ; it is not easy to imagine anything much cheaperthan £6 or £7 for the heating of a greenhouse 20x10, in-cluding an ornamental floor, every portion of which is pleasingto the eye as well as available for use. The consumption of fuelis equally moderate, and any kind of fuel can be used. I haveused cord-wood, uncleft faggots, and sawdust, and the chips out ofmy wood yard, and I find, as I expected, that, excepting in thedepth

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