Augusta Huiell Seaman, Jacqueline of the Carrier Pigeons… (1910)
“ From the turn of the canal to the wall was a distance of perhaps five hundred yards, an unoccupied space of ground like a meadow, broken by nothing save a little brook that connected with the canal. At the base of the wall this brook spread out for a space, like a miniature lake. Gysbert examined every inch of the ground attentively, without finding anything that might serve to enlighten him. At the face of the wall he stopped. Plainly no human being could scale at this point the high, smooth surface that confronted him. ”
