I could not reach far enough within to touch the opposite wall, but was convinced the space would prove sufficiently large to admit my body.
With a knife I tested the resistance of the mortar, breaking the point of the blade, yet detaching quite a chunk, and wrenching out one small stone.

Beyond doubt the task might be accomplished--but what was below?
How was I to get down those smoothly plastered walls--and back again, if necessary?
I glanced at my watch; it was already nearing noon, and at any moment food might be brought me.

I must wait until after that; then I should probably remain undisturbed for several hours.

I shoved back the bed in such position its head-board completely concealed the slight excavation, and sat down upon it, planning anew how best to proceed.

The time passed with no unusual sound reaching me from the hall without.