The bottom now rose sensibly, and we soon arrived at long circuitous slopes, or inclined planes, which took us higher by degrees; but we were obliged ...

The great grotto of Guachara, in Colombia, visited by the learned Humboldt; the vast and partially explored Mammoth Cave in Kentucky--what were these ...

Hour after hour passed without our coming to the termination of these floating weeds. If my astonishment increased, my patience was well-nigh exhauste...

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 ...

These last had brought with them certain fresh appliances that stood in an orderly manner about the cylinder. The second handling-machine was now comp...