Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 2 - By Alexander Von Humboldt And Aime Bonpland.


































































































































 -  Is it owing to sulphurets of calcium, of magnesium, or other
earthy metalloids, contained in the interior of our planet - Page 37
Personal Narrative Of Travels To The Equinoctial Regions Of America During The Years 1799-1804 - Volume 2 - By Alexander Von Humboldt And Aime Bonpland. - Page 37 of 777 - First - Home

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Is It Owing To Sulphurets Of Calcium, Of Magnesium, Or Other Earthy Metalloids, Contained In The Interior Of Our Planet, Under Its Rocky And Oxidated Crust?

In the ravine of the hot waters of Mariara, amidst little funnels, the temperature of which rises from 56 to 59 degrees, two species of aquatic plants vegetate; the one is membranaceous, and contains bubbles of air; the other has parallel fibres.

The first much resembles the Ulva labyrinthiformis of Vandelli, which the thermal waters of Europe furnish. At the island of Amsterdam, tufts of lycopodium and marchantia have been seen in places where the heat of the soil was far greater: such is the effect of an habitual stimulus on the organs of plants. The waters of Mariara contain no aquatic insects. Frogs are found in them, which, being probably chased by serpents, have leaped into the funnels, and there perished.

South of the ravine, in the plain extending towards the shore of the lake, another sulphureous spring gushes out, less hot and less impregnated with gas. The crevice whence this water issues is six toises higher than the funnel just described. The thermometer did not rise in the crevice above 42 degrees. The water is collected in a basin surrounded by large trees; it is nearly circular, from fifteen to eighteen feet diameter, and three feet deep. The slaves throw themselves into this bath at the end of the day, when covered with dust, after having worked in the neighbouring fields of indigo and sugar-cane.

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