244 
and then, find its way into some of these holes, where, 
instead of, a9 one would naturally suppose, its filling them 
up and forming pools (at least so long as the flood lasted), 
the water runs away into the earth as fast as it can pour in 
on all sides. 
On different shelves of the larger masses of fretted work, 
and at the bottom of the cavity from which we got out this 
specimen, were a number of smaller pieces, which might be 
called stalagmites, and which appear vitrified, so completely 
are they coated over with the deposited limestone. In some, 
the process is only partially carried out. It is a point by no 
means uninteresting to the Chemical Geologist, to observe or 
ascertain, in so narrow a space, that the water has had to 
fall or trickle through the exact point at which the water 
surcharged with carbonic acid ceased to dissolve and begun 
to deposit the solid matter. 
ON THE DILUVIAL AND GRAVEL BEDS OF YORKSHIRE AND 
NOTTINGHAMSHIRE. BY THE REV. W. THORP, OF 
MISSON VICARAGE, BAWTRY. 
The study of transported detritus is now exciting the atten- 
tion it deserves, as a method of explaining some of the last 
changes which have taken place on the earth's surface. Capt. 
Portlock (President of the Dublin Geological Society) says, 
" In every sand hillock or elevated gravel bank, there is a 
subject of study, leading to the inquiry how such deposits 
have been formed ; whether with a steady or slow action of 
the sea at higher levels ; by the force of submarine currents ; 
or any other form of glacial or aqueous agency. 
In Yorkshire and Nottinghamshire there are at least three 
distinct extensive tracts of gravel, of different geological ages, 
and derived from different transporting currents. There are 
