61 
1892 - 93 .] Dr Munro on a Bemai^kahle Glacier-Lake. 
be seen. The stranded icebergs lie pell-mell over the former bed 
of the lake ; but some, clinging among the mountains, v^here they 
have found a slight fastening, come sooner or later tumbling down, 
and it is very dangerous to travel in their vicinity.” 
It would appear from the above descriptions that the Eem- 
bidalsvand serves, to a certain extent, as a safety-valve against the 
sudden rush of water, by distributing its volume over the entire 
area of the lake, as, without it, the flood in the Simodal would be a 
veritable debacle. 
In a recent communication Mr Nasheim makes the following 
explanatory statement, which is more interesting because the sub- 
ject had not been suggested to him by any queries on my part : — 
“ You will not find the mountains so high at the north of the pond- 
lakes. I have spoken to people who have been there in the summer 
time, and they tell me that there are marks showing that the water 
from the pond-lakes has gone over the mountains on that side. 
Possibly this was the case when, at the end of the glacial period, 
the glacier blocking up the entrance to the valley of the pond-lakes 
had been much higher.” 
I am of opinion that the markings here referred to can be nothing 
else than the remains of an old lake-beach ; and, if so, the pheno- 
mena are perfectly analogous to the “ Parallel Eoads ” of Glenroy. 
But the point requires, as it certainly is worthy of, further investi- 
gation. 
These are the principal facts in regard to this glacier-lake which I 
have been able to bring together, and I think them worthy of some 
record, inasmuch as they help to explain the conditions under which 
such lakes are formed and the physical effects they are capable of 
producing. They probably played a more important part, as geolo- 
gical agents, during the quaternary period, than is now generally 
suspected, more especially during its later stages, when all the 
streams and rivers were filled to overflowing with the excess of 
water from the dissolving glaciers. From this point of view it may 
be of interest to recall the evidence of the existence of glacier-lakes 
furnished by these so-called parallel “ roads ” of Glenroy by way of 
showing that it corresponds in its minutest details with the facts 
above described. The level of each of these “ roads ” coincides 
with that of a “ col ” in an adjacent valley, which, for a certain 
