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their distance from each other.
They had also sunk a line of stakes across the glacier.
The change in the relative position of the two sets of signals and the curve in their line of stakes gave them, self-recorded, as it were, the rate of advance of the glacier as a whole, and also the comparative rate of progression in its different parts.
Great pains was also taken during the summer to measure the advance in every twenty-four hours, as well as to compare the diurnal with the nocturnal movement, and to ascertain the amount of surface waste.
The season was an unfavorable one, beginning so late and continuing so cold that the period of work was shortened.
Houghton, Mifflin and company, New York, Boston, 1885.
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