182 Mr. J. Davy’s Account of some Experiments on the 
fixed compound contains less chlorine than the volatile, and 
that the former, consequently, may be called ferrane, and the 
latter ferranea. 
Ferrane dissolves in water and forms the green muriat of 
iron ; but the solution of the whole substance is not complete. 
There is always left a small and variable quantity of black 
oxide, which may be considered, on account of its variability, 
in a state of mechanical mixture, rather than of chemical union 
with the ferrane. 
Ferranea is entirely soluble in water. The solution is iden- 
tical with the red muriat of iron. 
The analysis of both these compounds is easily effected by 
means of nitrat of silver. 
50 grains of ferrane were put into water: the insoluble 
residue separated from the solution by decantation ; washed, 
dried, and heated to redness for a minute, previously moistened 
with oil, weighed 3 grains, and was in the state of the black 
oxide, being attracted by the magnet. The solution entire, 
precipitated by nitrat of silver, afforded 102.5 grains of dried 
horn silver, which indicating 25.1125 grains of chlorine, the 
proportion of iron, omitting the 3 grains of oxide, appears to 
be 21.8875. And hence 100 of ferrane seem to consist of 
53.43 chlorine 
46.57 iron 
100.00 
Ferranea is not easily obtained in considerable quantities, I 
have been obliged in consequence to operate upon small por- 
tions. The subject of analysis was procured by sublimation 
from the residue by evaporation of the red muriat. 20 grains 
