"Neither do I," laughed my companion; "I shall have to look for it, as usual.  It is somewhere about here," she continued, pointing to a series of horizontal ledges that ran along the face of the cliff just opposite where we stood.  Moving forward, I saw Lotta stoop down to examine the ledges; then she moved slowly along the cliff face for a distance of a few yards, when, to my amazement, she suddenly vanished before my very eyes.  I sprang forward until I reached the spot at which she had disappeared, but was still unable to see anything of her.