1879.] 219 [Wright. 
Between Rowley and Georgetown the road passes north of Huns- 
low’s hill. A spur of the Haverhill series of kames was thought to 
start a little south-west of this hill. But north of the hill, and some 
distance to the east of this spur, a kame approaches the hill, and 
stops short at its foot, the hill rising immediately south of it one hun- 
dred or more feet. 
Again, in series No. XVIII, three miles below Lowell, the kame 
descends the valley from the north, to the Merrimack river. On 
the south side of the river, it appears in the bank, but completely 
covered with a deposit of levelly stratified loam, which is much above 
the present high water level. For some distance-in the stream, at 
low water, the ridge can be seen under the surface, on the south side 
of the river. A quarter of a mile south of the bank, the kame 
emerges from the loam, and ascends a steep hill. Half-way up, it 
turns a right angle, and in about ten rods, another right angle, and 
goes on its way to the highlands beyond. It does not ascend over 
two hundred feet above the river, however, before it descends again. 
These facts, and the frequent unstratified character of the material, 
make it apparent that the material forming the kames has, in many 
places, settled down in the irregular manner described by Clarence 
King, from ice which was at least two hundred feet thick. In no 
other way could the kame so accommodate itself to the original con- 
tour of the land. ‘This is confirmed by a section exposed in Andover, 
Mass., last fall. The kame near the red spring showed thirty or 
forty feet entirely without stratification, except that about one-third 
of the way from the bed, a reddish line (showing more oxidation of 
the iron than elsewhere), appeared clear across the section. 
One objection to supposing the material to have settled down in 
this way, is that frequently it is so local in character that it is not 
easy to see how it could first get on the back of the ice sheet. 
But there is usually in the kame, much mingling of local with for- 
eign material, and on any hypothesis it is difficult to account for the 
raising of pebbles to the height of the top of the kames. We should 
notice that the movement of a glacier over the surface of the rocks 
is somewhat analagous to that of a jack-plane over a board, and as 
the shavings rise above the top of the carpenter’s plane, so as a re- 
sultant of the onward motions and the friction, stoues may work 
up in the ice. Or it might be compared to the shaking of stones in 
a basket, in which the larger would rise to the top. 
nd 
ae Ne 
Se 
Same oa 
i a 
SE OP 
