568 MR. P. F. KENDALL ON A SYSTEM OF [Aug. 1902, 
the western slopes—for traces of ‘severed spurs’ near Derby, by 
which overflows might have evaded the end of an ice-lobe that 
deposited any of the sheets of Boulder-Clay described by Mr. Deeley,’ 
but without result. Similarly, I failed to find any sign of an over- 
flow from any part of the Trent Valley into the Severn drainage, 
though there are boulders of Red Chalk, a distinctive EKast-Coast 
rock, in the Drift of the Severn Basin. I can, moreover, find no 
definite traces of lakes in Yorkshire which could have drained at 
such a high altitude into the affluents of the Severn—all the lake- 
phenomena of Lake Humber lie below 200 feet O. D., and perhaps 
much below. 
Of low-level outlets two or three exist. The valleys of the Lea 
and the Churwell would, I think, repay examination, as one or the 
other, or even both, may have acted as lake-overflows; but these 
could not have carried off the waters of Lake Humber when, as in 
its last stages, its level was little above 100 feet O.D. At this 
altitude, when the Wash was closed, there would be but one channel 
by which drainage could escape, namely, by the singular valley 
which cuts completely across Norfolk, and in the central marshy 
portion of which, near Diss, the westward-flowing Little Ouse and 
the eastward-flowing Waveney have their common source. The 
Straits of Dover were, I think, not improbably brought into 
existence by the discharge of the overflow-waters of our British 
extra-morainic lakes, and a corresponding but much vaster series 
lying outside the great ice-sheet across the continent of Europe, as 
was long ago suggested by Belt.’ 
In conclusion, I gladly add a few words of grateful acknowledg- 
ment of the help and encouragement given on many occasions by 
Mr. H. B. Muff, B.A., F.G.S., the Rev. J. H. Hawell, M.A., FIG.S;, 
and Mr. J. W. Stather, F.G.S., who have been my companions in 
many journeys, in fair weather and in foul, over the Cleveland 
Hills; as well as to Mr. Godfrey Bingley, Mr. Geoffrey Hastings, 
Mr. Arthur Stather, and Dr. John Kirk for the beautiful photo- 
graphs from which many of the illustrations accompanying this 
paper are selected. 
EXPLANATION OF PLATES XX-XXYVIII. 
Puate XX, 
Fig. 1. View of Eller Beck and Fen Bogs from the north-west, showing the 
‘intake’ of the Newton Dale ~ overflow- channel and the contrast 
between the contours of the Eller-Beck and Newton-Dale valleys. 
The watershed is at the sharp bend of the railway. 
2. View looking up Eller Beck from the ‘intake’ of Newton Dale. 
Puate XXI, 
Newton Dale at Fen Bogs, viewed from Eller Beck. The stream in the 
foreground makes a sharp turn to the northward and leaves the great trench 
npionaniet 
1 Quart. Journ. Geol. Soe. vol. xlii (1886) p 437. 
2 Quart. Journ, Sei. vol. xiv (1877) pp. 67-90. 
