with the accepted theory of one degree to the one hundred feet descent.

A return to the beautiful Spring of Youth Room was now a necessity, but
we were careful to allow no drop of water falling from clay-stained
hands to reach the purity of that lovely bowl, and then being happy and
hungry, we retired to the piano's protecting tent for refreshment.

The atmosphere in Marble Cave has the peculiar bracing and invigorating
quality common to the majority of caves, that seems almost to defy
fatigue and encourage exertion that under ordinary conditions would be
impossible.

After the exertion necessary in the warmer portions of the cave, the
temperature of 42° proved rather low for comfort and finally was
admitted to be a sufficient reason for either leaving the cave or
sending out for the wraps. Slowly and reluctantly the party walked up
the long winding path to the summit of the Hill where the stairway
finds support, stopping many times to admire again the perfect curves
and fine color-tones of that wonderful high arch--within a mountain yet
softly radiant with the light of day.

Still lingering regretfully among the fern-decked rocks before quite
finishing the ascent to the actual outside world, the mercury lost
little time in registering eighty degrees.

Since no official, or even approximately correct map of Marble Cave has
yet been published, and the desirability of maps is particularly urged
by Monsieur E.A. Martel, a special effort was made to secure one, which
was accompanied by the following remarks from Mr. Prince in regard to
its incompleteness: