608 THE GLACIATION OF TEESDALE, WEARDALE, ETc. — [ Aug. 1902. 
hard of access, and superadded to these natural obstacles was the 
imperfection of the Ordnance map, as the 6-inch sheets were con- 
toured only at 100-foot intervals, and even this failed above an 
elevation of 1000 feet. The Author had to discover all the over- 
flow-channels of his district by laborious expeditions along every 
watershed, whereas in the case of the Cleveland area, he (the 
speaker) had been able to trace almost every dry valley by the 
beautiful contoured maps which they possessed in Yorkshire, before 
studying them in the field. He had some years ago worked over 
much of the region described, but had been unable to obtain any 
clear or connected ideas of the relation of the Glacial phenomena. 
Now, the Author’s researches had, he thought, quite satisfactorily 
explained them. 
The Avruor, in his reply, thanked Mr. Kendall for the information 
which he had kindly supplied regarding his work in the Cleveland 
Hills while that work was still in progress, without which the 
Author would have been unable to solve many of the problems in 
the area described. 
