it off and on, but no one has ever been able to explain what causes
it. Our 'diving ghost,' we call it. Father wore himself to a frazzle the
first year we were here, trying to find out what it was. He used to sit
up nights and watch, but although he often heard it he never could see
anything that could produce the sound. Some people about here have told
us that that sound has been heard for years and they say that there is
an old legend connected with it to the effect that many years ago an
Indian girl, pursued by an unwelcome suitor, jumped off this bluff and
drowned herself to escape him, and that ever since that occurrence this
strange sound has been noticeable. Of course, the people who tell the
legend say that the ghost of the persecuted maiden haunts the scene of
the tragedy at intervals and repeats the performance. Whatever it is, we
have never been able to account for the sound naturally, and always
refer to it as the Great Mystery Sound."

"What a strange thing!" exclaimed Sahwah in wonder. "Those footsteps
certainly sounded real; and as for that splash! It actually made my
flesh creep. I had a panicky feeling that one of the new girls had
wandered too near the edge of the bluff and had fallen into the water."

"It used to have that effect upon us at first, too," replied Miss Judy.
"We would all come racing down here with our hearts in our mouths,
expecting we knew not what. It took a long time before we could believe
it was a delusion.

"And now, come back to bed, or you'll be taking cold, standing out here
in your nightgown."

Still looking back at the river and half expecting to see some agitation
in its surface, Sahwah followed Miss Judy back to Gitchee-Gummee and
returned to bed.

CHAPTER IV

THE ALLEY INITIATION

Folk-dancing hour had just drawn to a close, and the long bugle for
swimming sounded through camp. The sets of eight which had been drawn up
on the tennis court in the formation of "If All the World Were Paper,"
broke and scattered as before a whirlwind as the girls raced for their
tents to get into bathing suits. Sahwah, as might be expected, was first
down on the dock, but close at her heels was another girl whom she
recognized as living in one of the Avenue tents. This girl, while
broader and heavier than Sahwah, moved with the same easy grace that
characterized Sahwah's movements, and like Sahwah, she seemed consumed
with impatience to get into the water.

"Oh, I wish Miss A