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DIRT-BANDS FROM THE FLEGERE.
367
DIRT-BANDS OF THE MER DE GLACE.
(26.)
These bands were first noticed by Prof. Forbes on the
24th of July, 1842, and described by him in the following
words:—" My eye was caught by a very peculiar appearance of the surface of the ice, which I was certain that I
now saw for the first time. It consisted of nearly hyperbolic brownish bands on the glacier, the curves pointing
downwards, and the two branches mingling indiscriminately
with the moraines, presenting an appearance of a succession
of waves some hundred feet apart." * From no single point
of view hitherto attained can all the Dirt-Bands of the
Mer de Glace be seen at once. To see those on the
terminal portion of the glacier, a station ought to be chosen
on the opposite range of the Brevent, a few hundred yards
beyond the Croix de la Flegere, where we stand exactly
in front of the glacier as it issues into the valley of Chamouni. The appearance of the bands upon the portion
here seen is represented in Fig. 35,
It will be seen that the bands are confined to one side
of the glacier, and either do not exist, or are obliterated by
the debris, upon the other side. The cause of the accumulation of dirt on the right side of the glacier is, that no less
than five moraines are crowded together at this side. In
the upper portions of the Mer de Glace these moraines are
distinct from each other; but in descending, the successive
engulfments and disgorgings of the blocks and ditt have
broken up the moraines; and at the place now before us the
materials which composed them are strewn confusedly on
the right side of the glacier. The portion of the ice on
which the dirt-bands appear is derived from the Col du
* ' Travels,' page 162,
| Title | Tyndall, John, 1860, The Glaciers of the Alps. |
| Alternative Title | Glaciers of the Alps. |
| Creator | John Tyndall 1820-1893. |
| Subject |
Glaciers -- Alps. Alps -- Description and travel. Color. |
| Publisher | London : John Murray ... |
| DateOriginal | 1860 |
| Format | Tiff |
| Extent | 33 cm. |
| Identifier | col022 |
| Call Number | QE576.T914 1860 |
| Language | English |
| Relation | Color Science |
| Collection | Ice - 19th Century Polar Exploration & Glacial Studies |
| Rights | http://www.lindahall.org/imagerepro/ |
| Data Contributor | Linda Hall Library, LHL Digital Collections. |
| Title | Page 367. |
| Creator | John Tyndall 1820-1893. |
| Subject |
Glaciers -- Alps. Alps -- Description and travel. Color. |
| Publisher | London : John Murray ... |
| Format | tiff |
| Identifier | col022408 |
| Call Number | QE576.T914 1860 |
| Relation-Is part of | Is part of: The glaciers of the Alps : Being a narrative of excursions and ascents, an account of the origin and phenomena of glaciers, and an exposition of the physical princples to which they are related / By John Tyndall... |
| Relation | Color Science |
| Rights | http://www.lindahall.org/imagerepro/ |
| OCR Transcript | DIRT-BANDS FROM THE FLEGERE. 367 DIRT-BANDS OF THE MER DE GLACE. (26.) These bands were first noticed by Prof. Forbes on the 24th of July, 1842, and described by him in the following words:—" My eye was caught by a very peculiar appearance of the surface of the ice, which I was certain that I now saw for the first time. It consisted of nearly hyperbolic brownish bands on the glacier, the curves pointing downwards, and the two branches mingling indiscriminately with the moraines, presenting an appearance of a succession of waves some hundred feet apart." * From no single point of view hitherto attained can all the Dirt-Bands of the Mer de Glace be seen at once. To see those on the terminal portion of the glacier, a station ought to be chosen on the opposite range of the Brevent, a few hundred yards beyond the Croix de la Flegere, where we stand exactly in front of the glacier as it issues into the valley of Chamouni. The appearance of the bands upon the portion here seen is represented in Fig. 35, It will be seen that the bands are confined to one side of the glacier, and either do not exist, or are obliterated by the debris, upon the other side. The cause of the accumulation of dirt on the right side of the glacier is, that no less than five moraines are crowded together at this side. In the upper portions of the Mer de Glace these moraines are distinct from each other; but in descending, the successive engulfments and disgorgings of the blocks and ditt have broken up the moraines; and at the place now before us the materials which composed them are strewn confusedly on the right side of the glacier. The portion of the ice on which the dirt-bands appear is derived from the Col du * ' Travels,' page 162, |
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