I staggered with it to the wall.

I came back for another; for some twenty minutes I was so employed; my ultimate reward a fine heap of boulders against the wall.
Then I began to build; then mounted my pile, clawing the wall to keep my balance.

My fingers were still many inches from the coping.

I jumped down and gave another ten minutes to the back-breaking work of carrying more boulders from the water to the wall.

Then I widened my cairn below, so that I could stand firmly before springing upon the pinnacle with which I completed it.