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146 in an emergency. Let's go back to camp, take a little lunch in our pockets, and try to scale the mountain."

They were soon on their way up the dizzy path once more, and, as they advanced, they found it growing more and more dangerous. In some places they found it almost impossible to get around certain corners, where there was barely room for their feet. As Tom remarked grimly, a fat man never could have done it. Fortunately they were all comparatively thin, for their hard work, and not too abundant food, since they had left the airship, had reduced their weight.

Up and up they went, higher and higher, sometimes finding the path wide enough for two to walk abreast, and again seeing it narrow almost to a ribbon. They hardly dared look down into the chasm at their left—a chasm filled, in part, with the rocks and boulders tossed into it by the lightning bolt.

Tom was in the lead, and had just made a dangerous turn around a shoulder of rock—one of those places where he had to extend both arms, and fairly hug the cliff before he could get around.

But, when he had made it, and found himself on a broad pathway, cut in the living rock, he