334 Dr. Mac Culloch on the Parallel Roads of Glen Roy. 



difficulties sufficiently perplexing in the latter case, were rendered 

 impracticable in the former, while the nature of the past summer, 

 1816, and that of the preceding, 1815, not less unfavourable in the 

 western highlands, have made it utterly impossible to renew the 

 investigation, originally made in 1814. 



From this cause I am unable to assert positively that there is an 

 identity of level between the lines of Glen Roy and those which 

 occur in Glen Gloy, although it will hereafter be seen that there is 

 but little, if any, reason to doubt it. I shall describe the appear- 

 ances as far as I was able to observe them ; when the reasons for 

 acquiescing in their common origin will appear. 



On entering Glen Gloy from Lowbridge no trace of a line can 

 be perceived for about three miles. The marks of three are then 

 to be seen on the salient angle of a green hill on the left bank of 

 the stream. As far as the eye can judge of their relative distances 

 (for I was unable to measure them) they appear to correspond to 

 those of Glen Roy : but the upper and lower one soon terminate, 

 while the middle one is continued for some little way up the val- 

 ley. On the right side of the stream, opposite to them, a very 

 strongly marked line of considerable breadth occurs, extending up 

 the valley for a long space beyond the reach of the eye, accom- 

 panied by an inferior one far less persistent. 



Being prevented from tracing this valley into Glen Roy, I at- 

 tempted to examine it in the opposite direction by entering from 

 Glen Turit. 1 have shewn that the lines of Glen Roy terminate 

 at the head of Glen Turit, in consequence of its elevation by which 

 their progress is at length naturally terminated. From this point 

 which separates the head of this glen from that of Glen Gloy, since 

 it is the common boundary of both, no line can be seen for a space 

 of three or four miles j at which point one commences on the right 



