Chemistry and Physics. 419 
complete. For the descriptions of the salts we must refer to the original 
memoir.— Ann. der Chemie und Pharmacie, |v, 179. 
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oxyd is formed, which, after settling and in large masses, possesses a dirty 
violet-red color. The ignited hydrate gives a deep brown-red oxyd, 
oy yellow color, and gives a bright yellow crystalline precipitate with sul- 
; phate of potash. Metallic cerium may be obtained by simply igniting 
the oxalate in a glass tube closed at one end and excluding the air as 
much as possible, It is a blackish-gray metallic powder, which, on gentle 
heating, burns to a red oxyd. Water appears not to oxydize it—Ann, 
der Chemie harmacie, cxxxi, 359. W. @. 
6. On Wasium.—Porr and DetaFonTAINE have, rR eI - 
chemists agree that the supposed : ; 
SD evtedle opp maintains that the oxyd of wasium is a mixture of the 
oxyds of yttriam, cerium and didymium, Delafoutaine considers it to be 
only oxyd of cerium. In any case, the suspicions expressed by Nicklés 
and by the writer of these notices in regard to wasium appear to have 
been well founded.—Ann. der Chem. und Pharm., cxxxi, 364, 368. 
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Ww. 
4. Preliminary notice of @ new earth—Biscuor has discovered in @ 
caleareous mineral a new earth which exhibits the following reactions, 
It is precipitated by sulphid of ammonium, completely by sh, imper- 
fectly by ammonia, as 4 gelatinous bluish-white precipitate. The last 
precipitation is not prevented by tartaric acid, and only partially by am- 
monia. The precipitate by potash or ammonia Is somewhat soluble in 
water and therefore be washed away. Carbonate of soda gives a 
