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and not otherwise. Private families comprise all such families with the exception of those
enumerated in (i) institutions or (ii) business establishments or boarding-houses in which the
number of resident trade assistants or resident boarders exceeds the number of members of
the employer's or householder's family (including private domestic servants).
Structurally Separate Dwellings.-—A structurally separate dwelling has been defined
for the Census as any room or set of rooms intended or used for habitation, having separate
access either to the street or to a common landing or staircase. Thus each flat in a block of
flats is a separate unit; a private house which has not been structurally sub-divided is
similarly a single unit whether occupied by one family or by several families. But where
a private house has been sub-divided into maisonnettes or portions, each having its front
door opening on to the street or on to a common landing or staircase to which visitors have
access, then each such portion is treated as a separate unit.
Rooms.—For the purpose of the Census, the rooms enumerated are the usual living
rooms, including bedrooms and kitchens, but excluding sculleries, landings, lobbies, closets,
bathrooms, or any warehouse, office or shop rooms.
The following Table, No. 53, shows the number of structurally separate dwellings
occupied, the number of rooms occupied, the number of private families, the population
in private families, and the average number of private families per dwelling in
1921 and 1931, together with the percentage increase or decrease. The increase in
the number of dwellings is practically entirely due to the number of new houses
constructed in the last ten years and there has been very little conversion of large
houses into self-contained flats.

The following Table, No. 54, shows the number of private families, the number
of structurally separate dwellings occupied, the number of rooms occupied, and the
average number of persons per room in each of the Wards in the Borough. If this
Table be compared with the preceding Table it will be seen that at the time of
the Census there were 507 structurally separate dwellings or 3,731 rooms unoccupied.