82 H. Wurtz’ Contributions to Analytical Chemistry. 
wise perfectly pure, left on evaporation with excess of nitric 
acid a deliquescent nitrate which still contained chlorine, and 
the latter was not wholly expelled by two repetitions of the 
same treatmen 
80. Lanthanum.—The chlorid used was also faintly tinted by 
chlorid of didymium, and probably not entirely free from chlorid 
of cerium. The nitrate, left upon evaporation with nitric acid, 
appeared to be much more eliquescent than the nitrate of 
cerium. Chlorine was retained as obstinately by it as by the lat- 
ter, a trace remaining after three evaporations with nitric acid. 
31. Didymium.—The chlorid of didymium, free from all im- 
purities except probable traces of chlorids of cerium and lantha- 
num, gave similar results. The resulting nitrate (still retaining 
a trace of chlorine) had a violet color and was deliquescent. 
32. Thorium. eee ue erfectly pure chlorid of Sorat was 
decomposed with ty, leaving after the third evaporation 
with nitric acid a opiates nitrate, which still contained a 
es of chlorine. This nitrate had a stron gly astringent taste. 
oe chlorid He alee resisted two oper- 
Molybdenum testis e scone ‘beaut erystals of pure 
molybae At dissolved in chloro d and evaporated 
with an excess of nitric acid, left a Po Oe NOE beautifully crys- 
tallized ; ASSES but a faint trace of nitric acid and no chlo- 
’ rine, small quantity of a blue substance appeared with the 
residue, the asoior of which was destroyed by nitric acid. 
35. Vanadium—Pure vanadic acid$ gave a beautiful green 
solution with chlorohydric acid, which, when evaporated wi 
nitric acid, left a fine brown residue containing no trace of chlo- 
rine or nitric acid, and insoluble or nearly so in water, being 
evidently nothing but vanadie acid. 
Preparations of the metals sridaion palladium, rhodium, ruthe- 
nium and yttrium I have been unable as yet to obtain in a state 
sufficiently pure to afford satisfactory results, and must there- 
fore one the consideration of these, togethe ther with my gen- 
eral conclusions oe Secacren from the soractets ¢ results, until 
a future communica’ 
With the ends ‘of ‘sulphur, phosphorus, selenium, telluriumy, 
boron, silicon, titanium and tantalum, it is of course useless to ex- 
periment, for according to Berzelius, H. Davy, and others, they 
Prepared from a specimen of orangite (thorite) presented to me by Mr. G 
SI a in muriatic acid, evaporat 
