At the botton of a long slant of greenish slimy stone, patched here and there with moss, I stopped a few minutes, feeling that I could not grasp without an effort the deep gloom and grandeur of my surroundings.

When the extremity of the tube, L, is brought near the gas burner that is to be lighted, it is only necessary to shove the botton, F, from left to right in order to produce a limited number of sparks sufficient to effect the lighting.