All these wonders I glimpsed in the space of a quarter of a mile, barely pausing, following Captain Nemo whose gestures kept beckoning me onward. Soon the nature of the seafloor changed. The plains of sand were followed by a bed of that viscous slime Americans call "ooze," which is composed exclusively of seashells rich in limestone or silica. Then we crossed a prairie of algae, open-sea plants that the waters hadn't yet torn loose, whose vegetation grew in wild profusion. Soft to the foot, these densely textured lawns would have rivaled the most luxuriant carpets woven by the hand of man. But while this greenery was sprawling under our steps, it didn't neglect us overhead. The surface of the water was crisscrossed by a floating arbor of marine plants belonging to that superabundant algae family that numbers more than 2,000 known species. I saw long ribbons of fucus drifting above me, some globular, others tubular: Laurencia, Cladostephus with the slenderest foliage, Rhodymenia palmata resembling the fan shapes of cactus. I observed that green-colored plants kept closer to the surface of the sea, while reds occupied a medium depth, which left blacks and browns in charge of designing gardens and flowerbeds in the ocean's lower strata.

These algae are a genuine prodigy of creation, one of the wonders of world flora. This family produces both the biggest and smallest vegetables in the world. Because, just as 40,000 near-invisible buds have been counted in one five-square-millimeter space, so also have fucus plants been gathered that were over 500 meters long!

We had been gone from the Nautilus for about an hour and a half. It was almost noon. I spotted this fact in the perpendicularity of the sun's rays, which were no longer refracted. The magic of these solar colors disappeared little by little, with emerald and sapphire shades vanishing from our surroundings altogether. We walked with steady steps that rang on the seafloor with astonishing intensity. The tiniest sounds were transmitted with a speed to which the ear is unaccustomed on shore. In fact, water is a better conductor of sound than air, and under the waves noises carry four times as fast.

Just then the seafloor began to slope sharply downward. The light took on a uniform hue. We reached a depth of 100 meters, by which point we were undergoing a pressure of ten atmospheres. But my diving clothes were built along such lines that I never suffered from this pressure. I felt only a certain tightness in the joints of my fingers, and even this discomfort soon disappeared. As for the exhaustion bound to accompany a two-hour stroll in such unfamiliar trappings--it was nil. Helped by the water, my movements were executed with startling ease.

Arriving at this 300-foot depth, I still detected the sun's rays, but just barely. Their intense brilliance had been followed by a reddish twilight, a midpoint between day and night. But we could see well enough to find our way, and it still wasn't necessary to activate the Ruhmkorff device.

Just then Captain Nemo stopped. He waited until I joined him, then he pointed a finger at some dark masses outlined in the shadows a short distance away.

"It's the forest of Crespo Island," I thought; and I was not mistaken.