384 IRON, NICKEL, COBALT, &c. 



ATOMIC WEIGHT. CERIUM. OXYCEtf. 



Cerium 6-25 



Protoxide 7'25 composed of 1 atom 4. 1 atom 



Peroxide 7 '7 5 1 + 11 



Action of 6. The following experiments to determine the 



reagents. t m c 



effects of reagents on protomuriate of cerium, 

 though they contain little novelty, are perhaps 

 worth recording ; because the salts and all the 

 reagents used were exceedingly pure. 



1 . Prussiate of potash A chalky white precipitate. 



2. Gallic acid and infusion of galls O 



3. Oxalic acid A copious white precipitate. 



4. Oxalate of Ammonia Ditto, redissolved by agitation. 



5. Tartaric acid O- 



6. Tartrate of potash A copious white precipitate. 



7. Bitartrate of potash O. 



8. Phosphoric acid A white precipitate. 



9. Phosphate of soda Abundance of white flocks. 



30. Carbonate of ammonia A milk white flocky precipitate. 



