378 TJie American Geologist. June, i898 
the latest stage of Lake Roy, with outflow at the col east of 
loch Laggan. 
In going up Glen Roy, I found moraine drift amassed 
east of the south part of Bohuntine hill, and more remarkably 
about a mile further north, adjoining the northeastern curving 
base of this hill, with stratified overwash drift, which was de- 
posited in lake Roy, extending with decreasing hight from 
the last mentioned moraine for a half mile or more up the glen. 
From the sharp bend of the highway on this prominent mo- 
raine, the best view of the Parallel Roads, running along the 
higher mountain sides, is obtained. 
Again, about two miles and a half farther up this narrow 
valley, another definite moraine was found, nearly blocking 
the glen, but cut in a deep gap by the stream, which flows 
some 200 feet below the crest of the moraine. 
But the most interesting morainic accumulation (as Prest- 
wich regarded it to be) occurs between two and three miles 
farther up Glen Roy, extending about three-fourths of a mile 
from north to south across the mouth of the river Turret, 
tributary to the Roy from the northwest. This massive drift 
accumulation rising 75 to 100 feet above the rivers Turret, 
and Roy, which I think to be a moraine amassed in the edge 
of lake Roy at its highest stage, consists largely of stratified 
drift, varying from laminated silt to coarse gravel wjth angu- 
lar boulders up to three or four feet in diameter. Jamieson 
thinks it a delta of the Turret, but this seems inconsistent with 
the open lower valley of that stream before it intersects this 
drift deposit. More in harmony with the other observations 
of moraines before noted, I believe Prestwich's view the true 
one, after reading Jamieson's discussion of it and examining 
the locality. 
The reference of the Parallel Roads to glacial lakes barred 
by the waning Scottish ice-sheet, which Jamieson has pre- 
sented in his latest paper on this subject, before cited, instead 
of his earlier explanation by barriers of local valley glaciers, 
seems to be supported by the series of about twenty retreatal 
moraines which have been here described in the order in 
which they were observed, opposite to the chronologic order 
of their formation by this receding remnant of the ice-sheet. 
Step by step, as shown by these moraines, the vanquished 
