Chemistry and Physics. 257 
of tungstic acid as yet imperfectly known. The different amids of 
phosphoric acid already described by M. Ger hardt _ sa ae 
compounds. “Ga, HE 
3. On the Decomposition os Iodid of Potassium ; by Pr of. SScxGeenpiie 
(Chem. Gazette, May Ist, 1850, from Pogg. Annal., Ixxviil, p.513.)— 
The anhydrous metallic acids, arsenic, molybdic, tungstic, antimonic and . 
chromic, when triturated with iodid af fap eg separate iodine even in ° 
the cold, and abundantly by the aid of heat; artificial stannic acid as 
well as the native tin-stone effect a similar “decembolegiais by heat i 
With bichromate of potash the whole of the iodine may be expelled, 2. 
while neutral chromate of pot and oxyd of chromium remain be- 
hind; three parts of the bichromate suffice to decompose two of the ns, 
iodid, the reaction being ie 
: 5(KO,2Cr 0, )+-3KI—8(KO Cr O,)+Cr, 0,+81. oe ale f 
~ Anhydrous perchlorid of iron liberates iodine from the iodid of po- _ Wee 
Lia 
tassium atthe ordinary temperature, and a highly concentrated solution — ie: 
of the perchlorid of iron, mixed with an equally concentrated solution ap 
of the iodid, precipitates a large portion. of the i odine in a ae 9 Be 
form ; Fe,: Cl 3 +KIl=2Fe CILK Ci+1. a 
The persulphate and all ay persalts. of i iron act, inva eidtior’ man nner, # ie td 
so that the peroxyd of iron may be used. lasiend dof” the i hal ae 
manganese to separate Sbding’ from alkaline: io + 
The dry persalis.of copper, erat the. phe liberat - 
the iodid-on the application of heat. fs € 
he bromid of potassium, in the aay ay is affected BA ae. 
redgents, but with less ease thatisthe iodi ichrom ag 
and persalts of iron are most efficient; the latter ae 
ployed in the moist way to obtain bromine by distillation, s 
The chlorids of K and Na are not decomposed by ; ~ ; 
agents, even ata strong heat; but a partial decomposition is effee “a F., 
pecially with bichromate of potash and the chlorids of Ba, Sn, Ca‘a De og ee 
8 attended with the evolution of chlorine and the gerne a 
4. On Furfurol; by A. Cano ovas: (Ann. de Chim. et ae Aab 
Xxvi, 277).—The author has reéxamined this substance pd se , 
ggg i 
: ‘“e 
mploying a little less sulphuric ric acid 
uch larger portion of the oil, 100: Beate of bran zeit ; 
of furfurol. 
be ae for two volumes tot 
—-3°346, ¢ 
oe or = had already been a 
Chlorine: and Kronb 
tric acid, 1 Whetbes c 
