There being no rooms or offices whatever below the level of the street, how, it may be asked, are the domestic arrangements carried on? The kitchens and offices are at the top of the house instead of the bottom. Plenty of light and ventilation are thus obtained; while hot odours, being lighter than common air, pass away without contaminating the living and sleeping apartments. All the larger houses are provided with lifts, up which provisions and stores can be conveyed. As there is a constant service of water, available to the highest story of every house, the kitchen boiler may be kept constantly filled; hot water from the boiler can be distributed by conducting pipes to the lower rooms, as well as cold water from the tank or cistern--an inestimable advantage, especially in bed-rooms. Every floor or story has a sink for waste water, whereby the carrying of the uncomfortable slop-pail up and down stairs is rendered unnecessary. The scullery, adjoining the kitchen, has an opening to the dust-shaft; and so have the several floors or stories, every opening being provided with a sliding-door or shutter. The dust-bin, into which the shaft descends, is under the basement of the house. The roof of the house is nearly flat, paved with asphalt or tiles; it serves either as a pleasant little garden or as a drying-ground for clothes--the wherewithal for a laundry being provided in connection with the scullery. The houses are built of a kind of brick which has the following sanitary advantages--glazed, so as to be impermeable to water and moisture; perforated, so as to admit of circulation of fresh air through the very substance of the walls; glazed in different colours for the interior of the rooms, thereby dispensing with the necessity for paint, paper-hanging, or whitewash, and affording scope for tasteful design in the selection and arrangement of the tints; smooth and hard, so as to be easily cleaned by washing; and some of them flattened into tiles for more convenient use as ceilings. Sea-sand is excluded from the mortar employed, on account of its tendency to imbibe and exude moisture. The chimneys, arranged on a plan prepared by Mr Spencer Wells, are all connected with central shafts; the smoke, drawn into these shafts, is passed through a gas-furnace to destroy the free carbon, and finally discharged colourless into the open air. 'At the expense of a small smoke-rate, the city is free from raised chimneys and the intolerable nuisance of smoke.' On the landing of the middle or second stories is a bath-room, supplied with hot and cold water from the kitchen above. The houses being built on arched subways, great facilities exist for the admission of gas and water into the several domiciles, and for the exit of sewage and refuse. All pipes are laid along the subways, and up thence into the houses; and workmen have easy access to these subways for the adjustment and repair of the several pipes.