166 



THE GEOLOGIST. 



Ferric acid. — The constituents of the ferric acid are 

 Fe. O^^ whence it is evident that this acid takes place by the 

 side of the chromic, manganic, sulphuric, and other acids ; 

 furthermore, the ferrates obtained either by the moist or dry 

 process have precisely the same composition. — M, Fremy. 



Meteoric stone. — On the 22d of March, 1841, at half- 

 past nine p.m., the inhabitants of Heinrichau, who were 

 abroad in the fields, heard three heavy reports, like thunder 

 claps, in the air, and soon after a whizzing noise, which 

 ended in a sound like that of a heavy body falling to the 

 ground. The sky, at the time, was almost wholly clear. 

 Some persons went in the direction from which the sound 

 came, and found, at the bottom of a fresh hole in the earth, 

 a stone, a portion of one much larger, and weighing two 

 pounds four ounces, three sides of which were broken, and 

 the fourth encrusted with a thin black covering peculiar to 

 meteorites. — Poggendorff's Annalen. 



Native Amalgam of Arqueros (Chili.) — This mi- 

 neral is composed of six atoms of silver and one atom of 

 mercury ; its constituents are constant, and it occurs den- 

 dritic and in small octahedral crystals. It is white as 

 silver, extends under the hammer, and may be cut with a 

 knife.^^ — Memoir by M, Donmjko, read at the Academy of 

 Sciences. 



Coal formation in Calabria. — This coal field is re- 

 presented as being of considerable extent, and the out-crop 

 of the coal measures is about four miles from the sea, dipping 

 S.E., at an angle of 20^ to 15^ .—Mining Journal, No. 349. 



The Magnesite formation of India. This forma- 

 tion is principally developed in the neighbourhood of Salem, 

 where it is found in considerable quantities, occupying an 



