For a long and weary hour we tramped over this great bed of bones. We advanced regardless of everything, drawn on by ardent curiosity. What other marvels did this great cavern contain--what other wondrous treasures for the scientific man? My eyes were quite prepared for any number of surprises, my imagination lived in expectation of something new and wonderful. The borders of the great Central Ocean had for some time disappeared behind the hills that were scattered over the ground occupied by the plain of bones. The imprudent and enthusiastic Professor, who did not care whether he lost himself or not, hurried me forward. We advanced silently, bathed in waves of electric fluid. By reason of a phenomenon which I cannot explain, and thanks to its extreme diffusion, now complete, the light illumined equally the sides of every hill and rock. Its seat appeared to be nowhere, in no determined force, and produced no shade whatever. The appearance presented was that of a tropical country at midday in summer--in the midst of the equatorial regions and under the vertical rays of the sun. All signs of vapor had disappeared. The rocks, the distant mountains, some confused masses of far-off forests, assumed a weird and mysterious aspect under this equal distribution of the luminous fluid! We resembled, to a certain extent, the mysterious personage in one of Hoffmann's fantastic tales--the man who lost his shadow. After we had walked about a mile farther, we came to the edge of a vast forest not, however, one of the vast mushroom forests we had discovered near Port Gretchen. It was the glorious and wild vegetation of the Tertiary period, in all its superb magnificence. Huge palms, of a species now unknown, superb palmacites--a genus of fossil palms from the coal formation--pines, yews, cypress, and conifers or cone-bearing trees, the whole bound together by an inextricable and complicated mass of creeping plants. A beautiful carpet of mosses and ferns grew beneath the trees. Pleasant brooks murmured beneath umbrageous boughs, little worthy of this name, for no shade did they give. Upon their borders grew small treelike shrubs, such as are seen in the hot countries on our own inhabited globe. The one thing wanting in these plants, these shrubs, these trees--was color! Forever deprived of the vivifying warmth of the sun, they were vapid and colorless. All shade was lost in one uniform tint, of a brown and faded character. The leaves were wholly devoid of verdure, and the flowers, so numerous during the Tertiary period which gave them birth, were without color and without perfume, something like paper discolored by long exposure to the atmosphere. My uncle ventured beneath the gigantic groves. I followed him, though not without a certain amount of apprehension. Since nature had shown herself capable of producing such stupendous vegetable supplies, why might we not meet with mammals just as large, and therefore dangerous?