. Edinburgh New Philosophical Journal . wr^ijr ^imMmjri of the glacier, and the ice be divided into imaginary com- partments by vertical sections; since, whilst AB moves 177 feet, CD moves but 141 feet, there is a condensation of the mass of ice A B C D, from back to front, of no less than 36 feet in that time, and so for the successive slices E F, &c. How, then, is this shrinking to be accounted for \ Not by the mere internal melting, for that would pro- duce merely a lowering of the surface, and a subsidence of the level of the ice ; such as I have shewn* actually takes place in other gl
. Edinburgh New Philosophical Journal . wr^ijr ^imMmjri of the glacier, and the ice be divided into imaginary com- partments by vertical sections; since, whilst AB moves 177 feet, CD moves but 141 feet, there is a condensation of the mass of ice A B C D, from back to front, of no less than 36 feet in that time, and so for the successive slices E F, &c. How, then, is this shrinking to be accounted for \ Not by the mere internal melting, for that would pro- duce merely a lowering of the surface, and a subsidence of the level of the ice ; such as I have shewn* actually takes place in other glaciers whose sections move with increasino> velocity on the whole. There is only a vis a tergo which can approximate the sections together, and, as we read in the Comptes Rendus, squeeze the moraine longitudinally, giv- ing it a greater breadth,t and condense the entire body of the ice so as to make it more compact in If we take a vertical section instead of a plan (see next page), the slice abed must be condensed into the hio-her and shorter solid c d ef, and so of the rest, and the surface * Travels, p. 153. t Les " Moraines me'dianes s'e'largissent dans la meme proportion que le mouvement se ; Comptes Rendus, 9th Dec. 1844, p. 1301. X lb. p. 1306, line 29.
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