i8 Reafons for fuppofing that 
rock, that formerly occup'’ed the opening which 
is now the entrance to the cove. 
Befides thefe, there are other vallies of greater 
extent, and more diftant from the fummits of the 
hills, which appear to be the worn-out refervoirs of 
ancient lakes. For, in them, the natural trate 
of the country are buried under deep beds of fand 
and pebbles. Their fides are frequently diverfified 
with little eminences, which, in figure and ftruc- 
ture, very much refemble the banks that are thrown 
up by currents: But their elevation above the 
neighbouring rivers forbids us to imagine that they 
were formed by them, as it is not uncommon to 
meet with fmall hills of the kind many yards abeve 
the limits of the greateft floods, but at the fame 
time, it is evident that they have been raifed by 
ftreams of confiderable force, as they confift wholly 
of rolled ftones, arranged in ftrata with beds of fand 
hetween them. ‘The fineft fand is found in the 
loweft and moft fequeftered places of thefe hoilows, 
in fuch fituations as theory afligns to it on the 
fuppofition that the bottom of a lake is the leaft 
agitated by ftorms, where the water is deepeft. 
In many places it is as fmall as that thrown up 
by the fea; but it differs in this refpect — fea-fand 
is more ‘or lefs mixed with fhells, but this contains 
none, though the lime-ftone that is often found in 
the neighbourhood abounds with them. From this 
fa& it may be very properly inferred, that the 
matter in queftion is of a more recent date, than 
the’ 
