FERRUM 179 



SECTION V. 

 Ferrum. 



Metallic iron is official in the form of fine, bright and 

 non-elastic wire, from which are made iron preparations and 

 reduced iron. 



Ferrum Keductum. Eeduced Iron. (U. S. & B. P.) 



Synonym. — Iron by hydrogen, Qiievenne's iron, ferrum 

 hydrogenio reductum, ferrum ope hydrogenii paratnm, E.; 

 ferrum redactum, P. G.; fer reduit par I'hydrogene, Fr.; 

 reducirtes eisen, G. 



Derivation. — Hydrogen gas is passed over freshly made 

 and carefully washed ferric oxide in a hot and closed tube. 

 Fe,03 + a H, = Fe, + 3 H,0. 



Properties.— A very fine grayish-black, lustreless powder, 

 without odor or taste ; permanent in dry air ; insoluble in 

 water or alcohol. 



Dose.—R.. 3i.-ii(4.-8.); C, 3 ii.-iv. (8.-15.); Sh. <fe. Sw., 

 gr.xx.-xxx. (1.3-2.); D., gr.i.-v. (.06-.3). 



Ferri Sulphas. Ferrous Sulphate. Fe So^ + 7 HjO. 

 (U. S. k B. P.) 



Synonym. — Copperas, green vitriol, vitriolum martis 

 purum, sulfas ferrosus, ferrum vitriolatum purum, E.; ferrum 

 sulphuricum purum, P. G.; sulfate de fer, sulfate ferreux, 

 Fr.; schwefelsaures eisenoxydul, G. 



Derivation. — Iron wire is dissolved by boiling in diluted 

 sulphuric acid. Fe, + 2 H,SO, = 2 Fe SO, + 2 H,. 



Properties. — Large, pale, blueish-green, monoclinic 

 prisms, without odor, and having a saline, styptic taste; 

 efflorescent in dry air. On exposure to moist air the crystals 

 rapidly absorb oxygen and become coated with brownish- 

 yellow, basic ferric sulphate ; soluble in 1.8 parts of water ; 

 insoluble in alcohol. 



