STRLE ON MOUNT MONADNOCK. 467 
as 5° east of north. So too, following along the northeast spur, 
there is no change in the striæ so long as the altitude remains 
the same. The crest is all naked rock for two miles and a half, 
or three miles, and frequent observations can be made. Just 
as fast as the ridge falls off in height the striae gain a more west- 
erly direction, becoming 15°, 20°, 25° west of north; where the 
rocky ridge terminates and is succeeded by open pastures, 30°, 
and in many places 40° west, were noted as common. Appear- 
ances indicated a local deflection of a current around the northern 
end of this long dam. 
Although a special expedition was made to what I have called 
the northwest spur, the lower portion of it was so much covered 
With drift that few exposed places could be found; some five or 
six however, and all that were noted, showed strie north 25° east. 
All the higher portions of the ridge were striated like the summit 
and the ridge before described. 
Another day’s expedition was made to the west spur. Standing 
on the crest of this lofty ridge and looking toward the south, the 
view is unobstructed to the horizon. The striz all along this 
ridge are innumerable and all north and south. There is no op- 
posing ridge near, to lead one to expect south of this a change in 
the striæ. On the contrary there is every facility for the drift cur- 
rent after passing this ridge to continue on in a straight course. 
The southern spur is a mile or more off on our left and presents a 
high Opposing barrier toward the southeast but none toward the 
south. Why should the drift current after passing this ridge, 
suddenly turn toward the east and climb the steep and lofty bar- 
rier of the south spur? Nevertheless there are indications of just 
such a change as this. 
If we place one foot of a pair of imaginary compasses on the 
Summit of Mt. Monadnock, and with the other strike a curve from 
the west spur to the south spur, we shall hardly bave made a more 
Complete change of direction from one spur to the other, than is 
indicated by the striz in the short space of a mile and a half. It 
is difficult to pass over all parts of the valley between these two 
Spurs, the upper portion of it being extremely craggy or uneven. 
It is better to go down to the open pastures at the base of the 
Mountain. Beginning at the foot of the western spur and skirting 
the base of the mountain toward the east, the first thing to excite 
attention is the immense number of bowlders. They exceed in 
