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Type II.
In schools of this class the principle of subdivision of the class
rooms has been carried further than in schools of Type I. Instead
of a single row of class rooms open on two sides to the outer air,
the class rooms are arranged in a double row without special
provision for intercommunication, so that one class room opens
directly into another without posessing the advantage of windows
opening on opposite sides of the room to the outer air.
Type III.
Schools classified as belonging to Type III. show an increase
in complexity of school structure. Provision is made for
separation of classes by subdivision into classrooms, and to
facilitate intercommunication, they are arranged so as to open on
to a common corridor. This permits of the removal of some of
the chief objections to Types I. and II.
Type IV.
Schools of Type IV. differ from those of Type III. only in
the fact that class rooms are arranged on either side of the common
corridor. The main objection to this type of school building is
that ventilation is obviously less perfectly provided for. The
double row of class rooms is separated by a corridor which, at
the best, can only open to the outer air at its extremities.
Type V.
Type V. may be looked upon as a modification of Type IV.
The central corridor has become expanded into a central hall round
which on two sides are ranged the class rooms.
Here again the objection urged against Type IV. holds good.
The ideal from the point of view of ventilation is to have the class
room walls exposed on opposite sides to the open air. Not only
with the increasing complexity of structure have the class rooms
been reduced to having one wall only so exposed, but, as will be