For this line of light was the sunlight, filtering slowly through a crevice at the joining of the stones; but the sides of the tomb had been fitted much closer than I reckoned for, and it was plain there would never be light in the place enough to guide me to my work.

All this I considered as I rested on the ground, for I had sat down again, feeling too tired to stand.

But as I kept my eye on the narrow streak of light I was much startled, for I looked at the south-west corner of the tomb, and yet was looking towards the sun.

This I gathered from the tone of the light; and although there was no direct outlet to the air, and only a glimmer came in, as I have said, yet I knew certainly that the sun was low in the west and falling full upon this stone.
Here was a surprise, and a sad one for me, for I perceived that I had slept away a day, and that the sun was setting for another night.

And yet it mattered little, for night or daytime there was no light to help me in this horrible place; and though my eyes had grown accustomed to the gloom, I could make out nothing to show me where to work.