Chapter 39 For another half hour we trod upon a pavement of bones. We pushed on, impelled by our burning curiosity. What other marvels did this cavern contain? What new treasures lay here for science to unfold? I was prepared for any surprise, my imagination was ready for any astonishment however astounding. We had long lost sight of the sea shore behind the hills of bones. The rash Professor, careless of losing his way, hurried me forward. We advanced in silence, bathed in luminous electric fluid. By some phenomenon which I am unable to explain, it lighted up all sides of every object equally. Such was its diffusiveness, there being no central point from which the light emanated, that shadows no longer existed. You might have thought yourself under the rays of a vertical sun in a tropic