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of M. Henri Coulon in the long and laborious excursions required for this part of the work.
This is not the place for scientific details.
For the results of Agassiz's researches on the Alpine glaciers, to which he devoted much of his time and energy during ten years, from 1836 to 1846, the reader is referred to his two larger works on this subject, the ‘Etudes sur les Glaciers,’ and the ‘Systeme Glaciaire.’
Of the work accomplished by him and his companions during these years this slight summary is given by his friend Guyot.1 ‘The position of eighteen of the most prominent rocks on the glacier was determined by careful triangulation by a skillful engineer, and measured year after year to establish the rate of motion of every part.
The differences in the rate of motion in the upper and lower part of the glacier, as well as in different seasons of the year, was ascertained; the amount of the annual melting was computed, and all the phenomena connected with it studied.
All the surrounding peaks,—the Jungfrau, the Schreckhorn, the Finsteraarhorn, most of them ’
1 See Biographical Sketch, published by Professor A. Guyot, under the auspices of the United States National Academy.
Houghton, Mifflin and company, New York, Boston, 1885.
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