Mary E. Bamford, Out of the Triangle: A Story of the Far East
“ But Timoteo had with him a long iron spike with which he intended to urge the abalone-shells from the rocks. The abalone has a large, very strong, white "foot" inside its long shell, and there is a row of holes in the shell itself. It is conjectured that the abalone perhaps exhausts the air under the shell, and so causes the shell to cling more tightly to the rock than ever, through atmospheric pressure. It is very difficult to take an abalone from its rocky home, unless the creature is surprised. ”
