228 7/" Ann ri<(l II (ii iiliHl'tsi . Octolifr. ISlil 
Willie ot tills ".Mp and till- low rniirs occurring in it as islands aiv 
sinootlicd. polislu'd and striatod in a high degivt'. On the islands 
t'spi'cially, lu'antifnl I'xampk's of sliijt (X'cur. following (.-vtM-v lit- 
tk' irri'gnlarity whitli the sides present. Strije ascend and de- 
sei'iid. Itotli straight and olili((Uel\ : enrve in varions ways and in 
varions planes, occur on the lower side of overhanging surfaces: 
not unconunonly proiluce beveled edges. The ice evick'ntly titled 
itself to tlieni like a glove. This local character of the striae on 
the mountains, in or adjoining the path of the ice is a noteworthy 
feature throughout this region, and very inipinlant in its bearing 
on the nature of the movement of glacial ice, close to the bottom 
and sides of its valley, showing a great complexity of movements de- 
pending on the configuration of the surface. Often the most in- 
significant obstacles suffice to cause a change in the direction of 
the strije. The finest example of striation in the region is fur- 
nished by the small limestone island in (J lacier bay on which fos- 
sils were found. The whole island is covered from end to end 
with the freshest and prettiest stria? one could wish to see. and 
I'xaniples are furnished of nearly all the variations that stria? can 
exhibit. 
Thegnurls nhnnj Mitir iiiht. — These gravels have been described 
in a previous part of this paper, with mention of the fact that the 
ice overruns them, and of the evidence that it formerly did so in 
great mass and for a considerable lapse of time. 
Tliese deposits are essentially unprotected an<l lie in the nar- 
rowest part of the narrow gap in which the ice must have exerted 
its greatest force. Yet in the last advance of the glacier over this 
spot a considerable thickness of these unconsolidated deposits 
was not removed, t 
()/,/ xnrfiicf fiiitiiris not ohlihnilnl. — On the mountains in Muir 
glacier basin from which the ice has recently retreated, surface 
features are occasionally observable which seem incompatible with 
the theory that glaciers vigorously erode hard rock. For example 
on the east side of II, along and over which ice of great thickness 
must have moved, a gully exists running (k)wn the side directly at 
right angles to the direction in which the glacier is moving. This 
iruUv has no great width nor depth. It is inconceivable that ice 
moving along the sides of such a mountain should cut out a 
gully of the kind running down the mountain directly at right 
t See G. F. Wright, Ice age in North America, p. 2ilo. 
