On one side are small houses, on the other the long wall of the Government quarries.

The street was empty; only now and then--very seldom--some one passed along it.

On the top of the wall, there were sentry-boxes built at intervals, for the warders to overlook the convicts.

But these were empty too.

The wall is not high; I suppose--in fact my father said--the quarry was deep on the other side." "Yes," said Chayne, quietly.