A narrow staircase mounts upwards to a grated aperture in one of the buttresses to admit air and light.

Other opening is there none.

'_Teter et fortis carcer_' is this dungeon styled in our monastic rolls, and it is well described, for it is black and strong enough.

Food is admitted to the miserable inmate of the cell by means of a revolving stone, but no interchange of speech can be held with those without.

A large stone is removed from the wall to admit the prisoner, and once immured, the masonry is mortised, and made solid as before.