Geology of England and Wales,” &c. 227 
mense manufacturing establishments, is deeply realized in 
Great Britain.* : 
Englishmen look forward, not without some anxiety, to 
the period, when their coal mines will be exhausted. 
following calculation, from the work before us, shows that 
such a time is yet quite remote. It applies, however, on- 
ly to the great coal field of Northumberland and Durham. 
“To form an idea, says Dr. Thomson, of the quantity 
of coal contained in the formation called the coal meas- 
ures, let us suppose it to extend in length from north to 
south twenty-three miles, and that its average breadth is 
eight miles. This makes a surface amounting to rather 
ds ; hole coal in this formation amounts to 
bilere ain corel h of this is already 
mous extent, that the quantity already 
i ‘ve the quantity of coal exported yearly 
siderable. [ conceive the q y “ions of chaldrons, for 
ts 11 millions. A chal- 
ise of tons of coals 
, sect, its in . from 
* Although an anpoetie subjeet, its importance drew forth a stanza 
one i jest poets. F 
sort apne the Persian would admire 
3 
E 
Ju 
ight, or would have store 
or wanka.e dents oc Hi suns give more? 
name, i 
I 
¢ 
I 
( 
Nay, what’s the sun, but, ma ‘erent 
A seek gi ram or flame! 
7 
‘The sun's heaven’s coalery, and coals 
+ The three last cyphers are omitted 
sly a mistake. . 
ee 
