Chemistry and Chemical Arts. 137 
iodic acid. Decant the mother-water, wash the acid once or twice 
with a little nitric acid, redissolve the residue in three times its 
weight of distilled water, and add to the solution two thirds its vol- 
ume of pure nitric acid and evaporate to dryness in a porcelain ecap- 
sule upon a sand bath, when very beautiful and perfectly = 
iodic acid will be obtained.—Idem. 
13. To obtain the Manganesiate of Potassa, by Wouter. (Jour. 
de Pharm., t. 19, p. 330.)—Melt in a platinum crucible over an al- 
coholic lamp some chlorate of potassa; dissolve in it a piece of al- 
coholic potassa, and add per oxide of manganese in powder. It dis- 
solves with a very pure green color; it then forms the green man- 
ganesiate of potassa and the chloride of potassium. Dissolve the 
mass in boiling water ; the green color changes to a brilliant purple 
because the manganesiate is converted into a per-manganesiate. 
Separate the precipitate by decantation and evaporate the solution: 
small opaque black crystals of the per manganesiate are obtained, 
which possess a greenish metallic lustre. This salt is isomor- 
phous with the per-chlorate, and they crystallize together in every 
proportion, affording salts of very handsome and various colors.— 
Idem. 
14. Memoir on Tellurium, by Berzewivs. (Ann. de Pog., t. 28, 
p- 392.)—The mineral employed to obtain the subject of experi- 
ment, was the tellurium ore from Schemnitz, in Hungary. The 
ore pulverized and carefully purified by washing, with double its 
Weight of carbonate of potash and a quantity of olive-oil sufficient 
to render the mixture pasty, was gradually heated in a covered cru- 
cible. The brown unmelted mass obtained was pulverized and treat- 
ed with boiling water; and the liquor filtered, away from contact of 
air. There remained upon the filter a black matter containing 
bismuth and carbon, but embracing only very little tellurium ; and 
the fluid, which was of a deep reddish purple, took up all the tellu- 
rium combined with the potassium. By passing air through the li- 
quor by means of the bellows, the potassium was oxidized and the 
tellurium precipitated. ‘There remained only in solution a small 
quantity of sulphur and of seleniuret of tellurium, which could be 
Separated by means of an acid. The tellurium on being well wash- 
ed, was melted ; after which in order to purify it, it was pulverized 
and placed in a little oval capsule, which was heated to a strong red 
Vou. XXVIII.—No. 1. 18 
