Notes and Comments. 147 
to post-glacial sculpture, while its mountain regions, like those 
of Scandinavia and the western half of Europe, indicate that 
little has been changed since the final retreat of the ice, except 
in districts when the rocks yield easily to other agents of 
denudation, and even in these the larger features, the broad 
outlines of the hills and valleys, are pre-glacial. So Iam unable 
to believe that these curious channels have been cut by over- 
flows from ice-dammed lakes, notwithstanding the ingenuity 
of the hypothesis and the industry of its supporters.’ 
PROFESSOR KENDALL’S REPLY. 
In the Geological Magazine for January and February, 
Professor Kendall replies.to Prof. Bonney’s pamphlet, but 
in such a mild manner that one is led to think that each of 
these champions of their respective schools has substituted a 
hair brush for his tomahawk, and instead of slashing at his 
opponent right and left, which process some of us once watched 
with childish joy, the greatest ‘damage’ now seems to be for 
one or other to have his hair, or what is left of it, parted in 
the wrong place! Sic transit. Prof. Kendall states that 
Prof. Bonney’s ‘ whole paper is so moderate, and the author’s 
appreciation of my work so generous, that I must break through 
my self-imposed rule of silence,’ thirteen years having elapsed 
' since his ‘ Glacier Dammed Lakes’ paper appeared. 
PROFESSOR KENDALL’S CONCLUSIONS. 
After dealing with the various points raised by Prof. 
Bonney, Prof. Kendall gives the following summary of the 
principal objections to Prof. Bonney’s explanation of these 
remarkable channels as relics of a very ancient drainage system, 
possibly antedating the Cretaceous period :—‘ (1) Their re- 
striction to the glaciated parts of our country ; (2) Their railway 
cutting contours prove them to have been produced by large 
volumes of water; (3) The evidence of their production at a 
very recent epoch; (4) The way in which they traverse 
watersheds and their indifference to the geological structure 
of the country ; (5) The continuity of the direction of their 
fall through wide tracts of country; (6) The discontinuity of 
the slope where wide gaps occur in the sequence; (7) The 
occurrence of aligned sequences along the face of escarpments 
and along both sides of a river valley; (8) The occurrence 
of many parallel channels trenching in a single spur; (g) Their 
occurrence in glacial deposits, though this goes more against 
the date than the mode of formation; (10) The rarity of any 
infilling of boulder-clay.’ 
“THE SUBMERGENCE.’ 
‘On the contrary hypothesis that these channels were 
produced, by the outflowing waters of temporary lakes upheld 
by an ice-barrier, all these phenomena find an explanation, 
1916 May 1. 
