468 STRLE ON MOUNT MONADNOCK. 
multitude any other deposit about the mountain, but form no part 
of its talus, which does not fall on this side. They seem to be in 
some way connected with the change of the drift current, which 
began at this place, and with the position of the ridge under the 
lee of which they lie. Passing through these bowlders which con- 
tinue for half a mile or more, we come to the first bare ledges; 
these are marked with striæ, N. 20° W. These are soon succeeded 
by others thirty, forty and fifty degrees west of north. They may 
not occur all in regular order; on some ledges there are two or 
three sets of strive of different angles. Proceeding a mile and a 
half we arrive at the easterly slope of the south spur near the 
Mountain House. The road to this house was built north and 
south on sloping ground, and for half a mile the fresh surface of 
the rock was in many places exposed to view. It is everywhere 
scratched and polished. ‘These scratches vary from 50° to 60° and 
70° west of north. Climbing the slope of the ridge, everywhere 
the exposed prominences of rock are embossed in the same direc- 
tion. Arriving at the crest of the ridge, it is everywhere serrated 
and uneven. 
On this height we again overlook the whole country. Here on 
the narrow crest of the ridge the striz are very generally north 
40° or 45° west. In one place an angular trough perhaps twenty 
feet long and six feet deep runs across the crest. In this there 
are long continuous striz due east and west. ‘They appear to be 
exceptional and suggest the idea that this shallow trough had been 
able to control and change the direction of the striating force. 
Standing on this ridge and looking toward the east, we see that 
the mountain on this side is very precipitous, and that probably 
there are no striz on its broken surface. Higher up the mountain, 
within a thousand feet of the summit, the striæ are 35° and 30° 
west of north; lower down at the extremity of the south spur, 
the end of the long dam, they vary from 40° to 25° west of north. 
What kind of stri should we expect to find under the lee of this 
four mile breakwater? Another expedition and another day were 
required to answer this question. ‘Lhe country east of the four 
mile ridge is mostly wooded and difficult to traverse. ‘The rock 18 
mostly covered with drift. Beginning at the south end and trav- 
elling north, no striz were found until two-thirds of the distance 
-~ had been passed over. Curiosity was at last gratified by finding 
ee large flat surfaces of naked rock scored all over with long parallel 
