718 
PROFESSOR PRESTWICH ON THE ORIGIN 
Levels of the “ x’oads ” longitudinal* with the valley, west side, in a length of 4 miles. 
Vertical scale of levels, mth inch=15 feet. 
Fig. 25 exhibits the difference of level of corresponding “ roads ” on the opposite 
sides of the valley at the three points marked a, b, c, in fig. 24. 
Fig. 25. 
Bo ad-s | 
TV? 2 +1 ^ W. a E. 
w. 1 E. 
...i.c-J 
Cols 
w . <?■ . E . MSI 
-to" 49 . 
■--.v.-.Y.v. -1148 
11 + a rrrr.:::::::::::::::. 
M46 —T . 
1070 -: V.-.V.V--.:- 
t.--.,- - l06 - 9 '°75 
-20 
+ 20 .. 
J\TP4- + 0° 857 — ----- 
- — 8 SO - 
8 52 
85 8 ‘ 
- 360 048 
Levels of the “roads ” transverse to the valley. 
0 marks the level of the cols, and—that of the “roads.” 
These variations of level extend the whole length of the “roads.” The following 
sketch-map, reduced from the 6-inch Ordnance map, shows the difference in the height 
of the “ roads ” lower down the valley, and in its lateral Glen Glaster. 
Fig. 26. 
