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Updated: May 20, 2025
The rock, snow-white where dry, is coated with red and orange gelatinous mats where the algae thrive in the over-flowing waters. Similar terraces of travertine are found to a height of fourteen hundred feet up the valley side.
Such was the region our Nautilus was visiting just then: a genuine prairie, a tightly woven carpet of algae, gulfweed, and bladder wrack so dense and compact a craft's stempost couldn't tear through it without difficulty. Accordingly, not wanting to entangle his propeller in this weed-choked mass, Captain Nemo stayed at a depth some meters below the surface of the waves.
The air is the agent of this transformation that gradually renders the bacteria benign, for in cultures made under the same circumstances as the preceding, but with the absence of air, the activity of these algae is preserved for days or weeks, and they will then cause death just as surely as they would have done at the end of one day.
Haeckel had already compared the yellow cells of Radiolarians to the so-called liver-cells of Velella; but the brothers Hertwig first recalled attention to the subject in 1879 by expressing their opinion that the well-known "pigment bodies" which occur in the endoderm cells of the tentacles of many sea-anemones were also parasitic algae.
He resembled those algae, termed the Prolococcus nivales, which give a rose-color to the Polar snows that conceal them, and flourish unsuspected amidst the general dissolution of Nature.
Many distinctions founded on this belief have since had to be abandoned. Species of algae belonging to the well-preserved group of the diatoms, are said to have remained unchanged from the Carboniferous period up to the present time.
Thinking it might be some strange sea bird caught in the meshes of the sea-weed, he ran to the crate and looked within. It was half filled with sea-moss and feathery algae. The cry was repeated. He brushed aside the weeds with his hands. It was not a wounded sea bird, but a living human child! As he lifted it from its damp enwrappings he saw that it was an infant eight or nine months old.
Anthea cereus, which contains most algae, probably far outnumbers all the other species of sea-anemones put together, and the Radiolarians which contain yellow cells are far more abundant than those which are destitute of them. Such instances, which might easily be multiplied, show that the association is beneficial to the animals concerned.
Ferragut sought on the bottom of the tanks the fishes of the deep, flattened animals that pass the greater part of their time sunk in the sand under a coverlet of algae.
But whether these "protoplasts" would, if we could examine them, be reckoned among the lowest microscopic algae, or fungi; or among those doubtful organisms which lie in the debatable land between animals and plants, is, in my judgment, a question on which a prudent biologist will reserve his opinion. I think that I have now disposed of those parts of Mr.
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