17 ^ 
part of all others which, I think, indicates such an origin, 
is the depression at the top of the small upper valley, which 
is precisely what a current coming from the north would 
produce there, as will be seen Irom Sec, 1 : for a current 
coming in that direction, and passing the northern side of 
the depression, which is double the height of the southern, 
would have a tendency to scoop out such an excavation, in 
the same manner as we see in all waterfalls and eddies. 
Moreover, the large expansion of the valley agrees, I think, 
better with this supposition than with any other. Whether 
or no this current was one produced by sudden elevation of 
land to the north, and was directly connected with the erratic 
drift which is found in such large quantity in the neighbour- 
hood, would be a problem of interest, but one which, I fear, 
would take up too much time to discuss. I might, however, 
remark, that I think it is more probable that it was excavated, 
and even laid dry to a certain extent, previously to the time 
when the chief part of the erratic drift was deposited; for, 
as far as I could ascertain, the detritus in this and similar 
valleys in the neighbourhood is entirely of local origin. On 
the contrary, the erratic drift appears to he confined chiefly, 
if not entirely, to a lower level, as though some portion of 
the higher lands had been above the level of the sea. 
I will not, however, enter farther into this subject, for I 
am most willing to confess that I think there are many 
serious difficulties to contend with in adopting any theory 
whatever to explain the mutual connexion of all the phe- 
nomena associated together in the neighbourhood ; though I 
am of opinion that the supposition of there having first been 
a wave of translation from the north, and subsequently drift- 
ing by means of ice-bergs, agrees with the whole phenomena 
better than anv other. 
