220 



BULLETIN OF THE 



tion of the one which runs along the eastern margin of the same pond ; 

 and there can be but little doubt that the loose structure observed at 

 the outlet prevails through the whole length of the retaining ridge. 

 But as a running stream can speedily change stones over whicli it passes 

 from irregular and angular forms to rounded and smoothed water-worn 

 pebbles, such as now cover the surface at the outlet, no proof that the 

 material of the ridge has the characters of a moraine deposit is attainable 

 till an amount of digging is performed for which we had neither time 

 nor tools. 



Half a mile from the point last named is a little bog, fifty by one 

 hundred feet in extent, represented in the heliotype as a faintly drawn 

 pond. Going outward from the basin, one steps from the surface of the 

 bog directly upon the foot of a narrow ridge, which rises abruptly to the 

 height of twenty feet, and as abruptly falls off on the opposite side to a 

 level much lower than that of the bog. Its relations to the adjacent 

 heights favor the view that it is the terminal moraine of a glacier that 

 came down a wide depression of the mountain side, between Pamela, 

 the " Horseback," and its flat-topped branch. The hollow is widest and 

 steepest above, and would constitute a promising gathering ground for 

 a glacier. So far as could be ascertained, without extensive digging, the 

 elevation apparently consists of loose material, which might be regarded 



as moraine debris. 



Higher up in the same hollow, and nearly at the end of the flat- 

 topped spar, is another diminutive pond, nestled behind what looks 

 from a distance like the renmant of a moraine deposited later than 

 the one below, and of which tiie greater part has been removed by de- 

 nudation. These ponds will forcibly remind one who is acquainted 

 with Viollct-lc-Duc's " Mont Blanc " of the small lakes held in place 

 upon that mountain by like ridges, w^hich are described as undoubted old 



moraines. 



The mouth of North Basin is shut across by a low hill, to be seen 

 in the heliotype. Viewed from the northern summits, it seems to be 

 the last deposited terminal moraine of a glacier which once occupied 

 that basin j but on closer inspection its aspect changes, and it is to bo 

 regarded only as a possible, not a probable moraine. And, indeed, as is 

 implied in the foregoing statements, the moraine-like form and location 

 of the elevations which have been considered sliould be held, prior to 

 thorough investigation, as indications that they may be, rather than 

 proofs that they are, deposits from local glaciers. 



Whether the depression on the northern side of the *^^orseback" 



