124 



THE GEOLOGIST. 



marks or lines are least discernible, being of much smaller dimen- 

 sions, and having a much greater conformity with the natural slopes 

 of the hill. Whatever loose matter occurs here consists of large 

 fragments from the hills above ; the natural rock projects in many 

 parts of the lines so as to interrupt them, or they are wanting when- 

 ever a solid mass of rock occurs in their course. Independently of 

 the principal lines, short indistinct traces of others are to be met with. 

 Proceeding down the glen, a river enters on the left, equal in size to 

 the Eoy, and falling into it by a cascade over a rocky bed. Here a 

 large series of terraces are found, forming a large terre-plein at top of 

 this lower glen. These terraces are of different levels, as may be 

 seen in the section and view accompanying this paper. The highest 

 of these is on a level with the third principal " road." Successive 

 stages of terraces descend to the bed of the river, the bottom of the 

 glen being an alluvial flat. The general breadth of the " roads " is 

 about sixty feet. Two glens, Glen Turit and Glen Fintec, open into 

 Glen Eoy, and on the sides of these " roads " are also seen. It is 

 near the opening to Glen Turit, that the third or lowermost line is 

 first seen. The following heights are given with others, by Macculloch, 



approximately by barometric measurements : — 



Upper line (" parallel road ") of Glen Roy above the Western Sea at Loch Eil . 1262 



Above the German Sea 1266 



Lowest line of Glen Roy above the Western Sea 976 



Upper line above land at Loch Oich 1180 



Lowest line above land at Loich Oich 886 



Upper line above the second in Glen Roy 82 



Second line above the lowest in Glen Roy 212 



Upper line of Glen Roy above the junction of the Roy and Spean ..... 927 



Lowest line of Glen Roy above the junction of the Roy and Spean 633 



Upper line of Glen Roy above Loch Spey 63 



Upper Hue of Glen Gloy above the Western Sea 1274 



Difference above highest of Glen Roy 12 



Bottom of Glen Roy at upper end above its bottom at the junction of the Roy and 



Spean, or its declivity 644 



Height of Loch Spey above the German Sea 1203 



On the left bank of the Spean, near the junction of the Eoy, a line 

 is visible, corresponding to the lowermost line of Glen Eoy. It runs 

 about three or four miles, but no corresponding line is found on 

 the right bank on the Spean. It finally disappears opposite to 

 Teindrish, where the valley is so wide that the opposite lines are four 

 miles asunder. Glen Turit is at so great an elevation where it enters 

 Glen Eoy, as to exclude the two lower lines ; but forms a connection 



