"Doubtless some freak of the volcanic nature of the earth hereabouts,"
explained the professor; "but they do, indeed, look curious."
The water of the lake, on being tested, was found to be quite fresh
and agreeable to the taste though it was warmish and seemed to have an
admixture of iron in it. All about them--strangest freak of all--small
geysers of hot water bubbled, sending up clouds of steam into the air.
"This is like an enchanted land," was Billy's comment, as he gazed
about him. Indeed, what with the towering black mountain above them
with its perpetual cloud of smoke hovering above its crest, the green
lakes of warm water and the bubbling, steaming geysers, it did seem
like another world than ours.
Some time was occupied by a thorough investigation of the small lake
and the boys and their scientific companion then advanced on a larger
one that lay at some distance.
"Do you think it is wise to go so far from the aeroplane?" asked
Harry.
"Why, there's nothing here that could attack us," the professor was
beginning, when he stopped short suddenly with an exclamation.
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