418 Scientific Intelligence. 
100; from Archives des Sciences Physiques et Naturelles, xviii, 343. 
Ww. G. 
4. On Yittria.—An investigation of this rare earth by Porp in Woh- 
ler’s laboratory leads to the not unwelcome result that the metals erbium 
and terbium, which have long figured in our books and taunted our ig- 
orance, have no real existence; what has hitherto been consid 
ou in the form of sesquioxyd, as the protoxyd is not precipitated 
ime. e hydrate was found to have approximately the formula 
Yttria is a strong base which expels ammonia from its 
on boiling, and exhibits much analogy with magnesia; all of its erystal- 
them and does not arise from manganese or didymium. 
yttrium, when examined by the spectroscope, exhibit five distinct black 
absorption lines, which do not correspond with those of didymium, but 
are characteristic for yttrium. Of these lines, one lies in the extreme 
ee ae 
metal as 34, within the limits of the errors of the analyses: this Is 
l 
gen. The author has analyzed and described a large num- 
rendered the chemical history of the metals tolerably 
