Notice of Hayden’s Geological Essays. 35 
_ We think, that he has not conceded enough to the rava- 
ges, committed by time, upon a part at least, of the stony 
monuments of the globe, whether clea by the Creator or 
by man. Stonehenge which he cites, — which is not 
granite, but sand stone,) is very deeply furrowed by time: 
the angles are rounded, and the stones are evidently reduced 
in size. The same thing is true of many of the ancient 
cathedrals, castles, te and other buildings in 
and Scotland. Wher they have not been kept in repair by 
assiduous attention, dooy are all in ridges, hollows, and prom- 
inen ces, decisive marks of the tooth of time, and many 
prominent: wes of considerable. uae, are. est or quite de- 
d. 
"Most ae aeSs Sih Sai Si eS 
ee: a Se ae Se Sp any 
a ee eee ag. d, both ancient 
rs pene ple ' <ere oar oh pa Diie, 
ae “eee : fers A 
e gr stone of the tic ; 
In Cornwall, one of the granite regions of rae = 
tensive ledges of granite, as we have seen, are crumbling 
own ina state of decomposition, and the granite of Limo- 
ges, in France, from which their excellent porcelain clay is 
ed, is decom in some instances almost to a clay. 
The: degradation of hills and mountains. is, we suspect, 
much more co: a than he admits it to be. We could 
freenstone t twenty-five feet in diameter , are | ¥* 
upon a declivity in just that confusion in which they. 
re fell, from some colonade of naked pillars, forming 
a greenstone ridge, and yet the nearest ridge, which is ma- 
terially higher, is a mile distant. The particular ridge from 
— they: originally fell, must have been, at hand, and al- 
its: ruins: seen pana the omer our chan praeten 3 
has proved hat. even since ecamples of alluvion are less 
attributa to the agency o of the rit them: 
: Vn wesbeon deine Taleot tn itn cn 
ine Albany ald age iy ; cs ee 
1 Unless. indeed ir + Bagleee vould rc that ements had more 
th s masses from seme other piace. 
