By CHAKLES KICHAKDSON, 
HE original draft of tins paper was written in I8665 and was 
JL printed in the Edinburgh Philosophical Journal of that 
year. Since that time, further consideration of the facts has 
induced me somewhat to modify my conclusions, and I have now, 
accordingly, entirely re-written the paper. 
At the time when the original paper was written, I had been 
living in Boss eight or nine years, during the construction of the 
Hereford, Boss and Gloucester Bailway, of which I was the 
Besident Engineer, In the construction of that line of railway, 
many deep cuttings were made through the old red sandstone, 
and four bridges were built across the Biver Wye, I had, 
therefore, unusual opportunities of becoming acquainted with, 
the facts detailed below. 
The part of the Eiver Wye more immediately alluded to in 
this paper and from which I shall draw most of my conclusions, 
is the six miles nearest to Boss, and is shown on the map 
exhibited on the wall. The river runs down from the north 
towards the south. The river itself is about eighty yards wide, 
with a fall of two feet six inches in a mile down its “general 
course.” In this term I include the river-formed alluvium as 
well as the stream itself ; for the position in the alluvial land at 
