197 



IRON CITRATE WITH QUIXETUM. 



Note. This specimen is a citrate of the mixed alkaloids of cinchona 

 bark. 



The last six specimens are nucrystallizable, and are not definite 

 chemical compounds. 



320. FERUOCYANIDE. Fe 4 Fcy s . 



a. Amorphous masses. (Prussian Blue.) 



321. IODIDE. Fe I 2 . (Ferri lodidum, B.P.) 



a. Crystalline masses, of a bluish-green colour. 

 Note. This salt generally contains a little peroxide. 



322. LACTATE. FeC 3 H 4 3 . 



a. Crystallized. 



323. OXALATE. Fe C 8 4 . 



a. Chamois-yellow powder. 



324. OXIDE, MAGNETIC. Fe 3 4 . 



a. Scales detached during the forging of wrought iron. 

 Note. These scales consist principally of magnetic oxide, with some of 

 the metal. 



6. Brownish- black powder. (Ferri Oxidum Magneticum, 

 B.P. Ferri Oxidum, Nignim.) 



325. PEROXIDE. Fe 2 3 



a. Purplish-red powder. Venetian Red, Jewellers 1 Rouge, 



Colcoihar, Crocus Martis.) 



b. Dark rusty-brown powder. 



c. Pale brownish-red powder. 



d. Armenian bole. 



Note. Specimen a was prepared by the calcination of ferrous sulphate; 

 specimen b is readily soluble in hydrochloric acid, and specimen c not 

 entirely so, probably on account of containing some basic salt. The 

 latter much resembles in colour some specimens of sulphide of antimony. 

 Specimen d consists of clay, coloured naturally by ferric oxide. 



326. PROTOPHOSPHATE. Fe 3 2PO 4 . (Ferri Phosphas, B.P. Ferrous 



Phosphate.) 



a. Powder of a slate-blue colour. 



Note. When prepared without access of air, this salt is white ; when 

 blue, it contains some ferric oxide. 



o~27. PERPHOSPHATE. Fe 2 2 P O v (Ferric Phosphate.) 

 a. White powder. 



328. PYROPHOSPHATE. 



a. Pseudo-crystalline scales. 



Note. This preparation consists of a compound of ferric phosphate 

 with citrate of ammonium. It much resembles in appearance the citrate 

 of iron and quinine, but has generally a bluish-green tint. 



329. SULPHATE. Fe S 4 , 7 H 3 0. 



a. Crystals. (Green Copperas, Green Vitriol.) 



