Natural History. — Mineralogy. 213 
of water ; and sometimes there appears a vegetable-like matter 
floating on the water. 
35. Strontites and Precious Opal^ ^c. in the Faroe Islands. 
— Vargas Bedemar, who has lately spent a year in examining 
the geognostic structure of the Faroe Islands, discovered stron- 
tites, in secondary trap ; also opal, most frequently the preci- 
ous kind, and but rarely the common or semi-opal ; and he men- 
tions having found adularia, heliotrope, and black flint, also in 
the trap rocks. 
36. Boues Geology of Scotland. — We have great pleasure 
in recommending this work to the particular attention of geo- 
logists. It is by far the best general account of the geo- 
gnostic structure of Scotland hitherto publishedj and does in- 
finite credit to the industry and learning of Dr Boue. We 
feel confident, that this young and enterprising observer will 
contribute in an eminent degree to the progress of geology, and 
continue to reflect honour on that school where he commenced 
his auspicious career. 
37. Mdhis Characteristic. — An English translation by Pro- 
fessor Mohs himself, of his Characteristic, or Characters of the 
Classes, Orders, Genera, and Species, of Minerals, has been 
lately published at Edinburgh i This classical work is but the 
forerunner of the System of Crystallography of this profound 
naturalist. The perusal of the Essay on the Crystallography 
and Natural History System of Mohs, in this Journal, will be 
found very useful to those who study the Characteristic. 
38. Hausmann^s New Mineralogical Worh. — Professof 
Hausmann, we understand, is at present printing a large Avork, 
‘‘ On the Forms of the Inorganic Kingdom,” of which the first 
part will appear next Easter, and the second the following sum- 
mer. Having finished this interesting work, he will next pre- 
pare and put to press an account of his geognostical investiga- 
tions in the Alps and in Italy, 
39. Alpine Limestone same age as Oolite and Lias. — In a 
letter from Count Breiinner, we are informed, that he, along 
with Messrs Buckland and Greenough, obtained, by actual exa^ 
mination, five excellent sections of the Alps, which enabled them 
