53 
on analysis by Mr. Emsrey, shewed 54 and 67 per cent. of Silica 
respectively. 
To shew how observations carefully made often give the clue 
to the solution of interesting Geological difficulties, I hope I 
may not be deemed egotistical in the two following illustrations. 
When the Cowley property was on sale I went with a 
friend to look over it, and we were shewn the land by a very 
intelligent bailiff, from whom I enquired, “If he had ever seen 
any round liver-looking pebbles ?” to which he answered “No.” 
The fields we were walking over were very bare of soil, and I 
asked, “If there were any in which there was clay 2” He said 
«There is one field upon the estate ;” and we had not been in 
it five minutes before I recognized my old acquaintances the 
N. D. pebbles and some flint. 
Again, last year, on enquiring of my friend Mr. F. Wirts, 
of Upper Slaughter, if he had any round pebbles on his farm, 
he replied also in the negative. I then said, “ Have you any 
clay ground?” “ Certainly,” he replied; “ I have a very 
stiff field ;” and I remarked, “ Then I can find the pebbles.” 
He kindly invited me to visit him, and accompanied by his 
father, the Rev. E. W1rts, F.G.S., one of our members, who 
had also never seen any ; we went to the field where we were 
soon rewarded by picking up white quartz pebbles and some 
flint. 
I trust I have now shewn the occurrence of the N. D. 
from the neighbourhood of Stow in the north, to Uley Bury in 
the south, a distance of fully thirty miles, and that the Boulder- 
clay, usually associated with the drift, is met with in many 
places over the Cotteswolds. 
Professor Puriires, in his work on “ The Geology of the Valley 
of the Thames,” in speaking of the Cotteswolds having been 
submerged beneath the sea, says, «The sea may have covered the 
highest hills, but proof fails at 750 feet, according to the careful 
researches of Mr. Hux and Mr. Lucy, which I am happy to 
confirm.” 
My extended observations, however, now shew that proof 
does not cease, as I formerly supposed, at 750 feet, but that the 
