Chemistry and Physics. 127 
from the mean of the last three deduces the numbers 48°82 (or 610°37 
O= 100) as the equivalent of niobium. 
Chlorid of niobium, NbCle, dissolves in chlorhydrie acid; after some 
time the solution becomes turbid and gelatinizes. Water does not com- 
ch gelatinizes with water. en the alccholic solution is dis- 
tilled, aleohol, chlorid of ethyl, and finally, chlorhydric acid pass over, 
). The sod ts are 
NaF NbF2, (2NaF +4 NbF2) + (NaF + HF), and (NaF + NbF2) + 
: ). ! 
purity—Pogg. Ann., civ, 310, 432, 581. 
7 On the constitution of titaniferous iron ores.—RAMMELSBERG has 
Published an elaborate investigation of the titaniferous iron ores, the 
Principal results of which are as follows : 
(1.) The greater number of the titaniferous iron ores, among them all 
the crystallized forms, consist of 1 eq. of titanic acid and 1 eq. of pro- 
toxyd of iron (prot. of manganese or magnesi 
2.) Magnesia is an essential constituent of all these ores. In the erys- 
tallized mineral from Layton, the magnesia amounts to 14 per cent. 
_ (3.) According to Mosander’s theory the titaniferous iron ores are either 
simply titanates of protoxyd of iron i; with isomorphous admixtures 
of titanate of magnesia or mixtures of such with sesquioxyd of iron, for 
© Most part in simple proportions. ‘ 3 | 
(4.) The theory of H. Rose that these ores consist of isomorphous ses-— 
qioxyds of titanium and iron, would require the assumption of a sesqui- 
oxyd of magnesium. . | 
(5.) The authot prefers Mosander’s theory for the present state of our 
knowled e. 
(6.) In Iserin we find grains consisting of FeTi, and FeTis. ‘ 
m3 No titaniferous iron erystallizing in regular octahedrons is known. 
Pt Stes wagered octahedral grains which contain titanium appear to 
mixtures,’ 
