By Prof. C. LLOYD MORGAN, F.G.S., Assoc. R.S.M. 
CONTENTS. 
1 . — Introduction. 
2. — Sub-aerial Denudation, general and special. 
3. — The physical features of the area under consideration. 
4. — The geological structure of the area under consideration. 
5. — The age of the rocks at King’s Weston. 
6. — The Avon Gorge. 
7. — The Clifton fault. 
8. — The Gloucestershire tributaries. 
9. — The Curves of the Avon. 
10. — The Somersetshire tributaries. 
11. — Conclusion. 
1. — Introduction, 
HEN the Geological Section of this Society did me the 
f » honour of inviting me to be their president, I bethought 
me in what way I could best fulfil what seemed to me one of 
the most important duties of that position. For it is, I take it, 
the primary function of such a Society as ours, to investigate 
and elucidate the Natural History—rusing these words in their 
widest signification — of our own immediate neighbourhood. 
And it should therefore be the object of the president of the 
Geological Section, to endeavour to add something to our 
