112 Scientific Intelligence. 
may however show that coeval with the country of the Iguanodon there 
were regions tenanted by bi mammalia ; and that the almost 
exclusively reptilian fauna of the lands whose zoological and botanical 
characters have formed the subject of this Lecture, was but an exag 
gerated condition of that state of the animal kingdom which is exhibited 
y the present fauna of the Galapagos Islands.* lg 
In conclusion, Dr. Mantell alluded to the recent discovery of reptilian 
remains (the Telerpeton Elginense, and the presumed Chelonian foot 
tracks) in the Old Red Sandstone of Morayshire,t in proof of the ne 
cessity of bearing in mind the salutary caution of Sir Charles Lyell, 
** that as our acquaintance with the living creation of past ages must de 
pend in a great degree on what we term chance, we ought never to as 
sume that the first appearance of any type of animals or plants too 
place at the precise point where our retrospective knowledge happens 
to stop.” 
had occasion, a few months since, to visit the southern portion of Ile 
nois, I explored this locality. It was found however that the fluor-spat 
orless, frequently of a blue, a violet, or a pink tint, and more rarely of 
an emerald-green. 
The localities have been quite extensively worked for lead, whieh 
under the form of galena, is associated with the fluor. The amou? 
lizations of fluor, as a compact variety in which the associated a 
also has the compact structure. An immense amount of a remarkab} 
fine quality of fluor-spar could be obtained from these veins show 
. 
of zinc-blende and calcite. : : 
Five miles back from Elizabethtown, in the same county, is 22 - 
tensive deposit of bog and pipe iron-ore. Two furnaces have 
erected near the mine. haere © 
itre is found about a mile north of the river between Blizabe 
town and Rosiclare. 
* See “ Wonders of Geology,” Sixth Ed., p. 893. : 
+ Lyell’s “ Manual of Geology,” Fourth Ed. p. x. 
