310 Scientific Intelligence. [Ocr. 
of the Geological Transactions, and the author thinks it proba- 
ble that it may rest on greenstone analogous to that of those two 
situations.. The shelllimestone also of Bromsgrove Lickie being 
identical with that which occupies a still higher portion in both 
those ridges. ‘ 
Between Cradly and Stourbridge in the north-east angle of 
Worcestershire, fragments of the quartz rock rounded by attri- 
tion are found in a gravel pit imbedded in what seems to be a 
decomposing trap, probably identical with the slaty micaceous 
greenstone of the Wrekin. Portions of the trap fall off from the 
sides of the pit in flakes ; but it is remarkable that the planes of 
separation pass without interruption through the pebbles of 
quartz rock and the trap; so that the sides consist of smooth 
vertical surfaces, like those which are said to occur in the cliffs 
of the pudding stone at Callender. 
ArticLte XVII. 
SCIENTIFIC INTELLIGENCE, AND NOTICES OF SUBJECTS 
CONNECTED WITH SCIENCE, 
I. Analysis of an Iron-ore from Brazil. 
Baron d’Eschwege, director-general of the mines of Brazil, has sent 
to M. Vauquelin for analysis a specimen of an iron-ore, which is found 
in detached pieces with micaceous iron-ore and topazes, in de- 
composed chlorite-islate, at Capao, near Villa Rica. The colour of 
this mineral is black ; its fracture has a very strong lustre, resplendent 
asamirror. When bruised, it is reduced into little micaceous laminz ; 
its powder is brown, and it is slightly attracted by the magnet. Sp. 
gr. 5260. In muriatic acid it dissolves entirely, but is insoluble in 
nitric acid; exposed to a red heat, it augments a little in weight. 
Dissolved in muriatic acid, it precipitates gold from its solution in 
the metallic state, proving that it contains protoxide of iron; but as a 
large quantity of the ore is requisite to precipitate a small quantity of 
gold, it cannot contain much of that compound. M. Vauquelin con- 
cludes, from an experiment in which 200 parts, calcined in a platinum 
crucible, augmented in weight 3 per cent., that thisiron-ore consists of 
Peroxide of iron..... kaiicsiceths Seas salvia 
PTOLOKIGE WOE ILO so st bene eM  ( 
100 
besides a small quantity of phosphoric acid and of manganese, It is 
probable, he observes, that all the iron-ores slightly attractable by the 
magnet, are similarly constituted.—( Ann. de Chim. &c. xx. p. 85.) 
Il. Geology of the Sierra Nevada of Grenada. 
This chain of mountains, more elevated than the Pyrenees, and 
crowned, on some points, with eternal snows, has been geoguostically 
