As each house is complete within itself in all its arrangements, those
disfigurements called back premises are not required. There is a wide
space consequently between the back fronts of all houses, which space
is, in every instance, turned into a garden square, kept in neat
order, ornamented with flowers and trees, and furnished with
playgrounds for children, young and old.

The houses being built on arched subways, great convenience exists
for conveying sewage from, and for conducting water and gas into, the
different domiciles. All pipes are conveyed along the subways, and
enter each house from beneath. Thus the mains of the water pipe and
the mains of the gas are within instant control on the first floor of
the building, and a leakage from either can be immediately prevented.
The officers who supply the commodities of gas and water have
admission to the subways, and find it most easy and economical to keep
all that is under their charge in perfect repair. The sewers of the
houses run along the floors of the subways, and are built in brick.
They empty into three cross main sewers. They are trapped for each
house, and as the water supply is continuous, they are kept well
flushed. In addition to the house flushings there are special openings
into the sewers by which, at any time, under the direction of the
sanitary officer, an independent flushing can be carried out. The
sewers are ventilated into tall shafts from the mains by means of a
pneumatic engine.

The water-closets in the houses are situated on the middle and
basement floors. The continuous water-supply flushes them without
danger of charging the drinking water with gases emanating from the
closet; a danger so imminent in the present method of cisterns, which