94 THE ARCHAEOLOGY OF THE DISTRICT
runs a very substantial substructure wall, and the little
space immediately inside it was covered with a thick
cement, made out of powdered granite, out of which
steps had been formed leading down to the various
passages which converge here from the centre of the
building. The presence of this concrete in use for
flooring and steps in buildings constructed without
mortar is interesting, showing that dry building was
used not from necessity but from choice.
The entrance to the north-west had been walled
up, and we had to climb over a heap of stones to
gain admittance until it was opened out. It is narrow
and straight, and protected by two buttresses on the
inside. The wall here is very inferior to what it is at
the main entrance. There was also another entrance
