GLACIAL DRIFT. 257 
and nearly all the boulders seem to have come from that direction. The 
schists like those at Portland, Me., cannot be indisputably proved to have 
come from that quarter; but if there were evidence of a south-west cur- 
rent, I should refer to that locality for their origin. The most difficult 
fragment to explain is the piece of limestone about a foot through, found 
at the eastern edge of the cliff. It is drab colored, weathering reddish, 
and tarnishes quickly after exposure. There is nothing like it in New 
Hampshire, nor in western Maine. It is like some limestones from the 
vicinity of Machias, 190 miles distant north-east in an air line, or New 
Brunswick, much farther. I inquired whether ballast from schooners 
might not have been thrown out upon the beach; but those who have 
lived here for many years thought the stone could not have been brought. 
in that way. Our conclusion is, that the stone came from the bank, more 
likely the upper than the lower division, and that its original source was 
towards the north-east. We need, however, confirmatory observations 
before throwing down the gauntlet in favor of this proposition. 
Dover. 
The locality examined is the excavation in the kame half a mile north-- 
west from the post-office, made by the Dover & Winnipiseogee Railroad, 
figured and described upon page 158. The previous example was in till; 
this is in material derived from the modification of the upper till, and the 
stones have travelled somewhat further than to their place of deposit 
from the glacier. The largest stone I have seen in any gravel deposit 
in the state occurs here, weighing sixteen tons. There are others two 
thirds the size of this, all of mica schist, with rough edges, showing only 
a short carriage. It is the rock of the neighborhood, and consequently 
the most abundantly represented among the pebbles. Others are fine- 
grained granites, Montalban schists, Concord granite, trap rocks, White 
Mountain porphyry, red porphyry (like that occurring upon Mt. Lowell), 
Albany granite, Tripyramid diorite, sienite (like that on Red hil), sienite 
with two kinds of feldspar, and the granite of Hart’s Location, such as 
has. been quarried on Sawyer’s river. Probably ten per cent. of these 
stones came from the White Mountains, some of which can be shown to 
have been carried more than sixty-five miles. Perhaps most of them 
might have been derived from the Ossipee group, within forty miles, 
