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"Good," said my uncle, observing the hour, "in ten we shall start again." "In ten minutes?" "Yes--precisely. We have to do with a volcano, the eruption of which is intermittent. We are compelled to breathe just as it does." Nothing could be more true. At the exact minute he had indicated, we were again launched on high with extreme rapidity. Not to be cast off the raft, it was necessary to hold on to the beams. Then the hoist again ceased. Many times since have I thought of this singular phenomenon without being able to find for it any satisfactory explanation. Nevertheless, it appeared quite clear to me, that we were not in the principal chimney of the volcano, but in an accessory conduit, where we felt the counter shock of the great and principal tunnel filled by burning lava. It is