8 URANIUM, ANTIMONY, CHROMIUM, &c. 



salts into which it enters as a base crystallizes 

 except the nitrate ; but it forms many crystal- 

 lizable triple salts. I have examined 



Persulphate of uranium and potash, 

 Permuriate of uranium and potash, 

 Percarbonate of uranium and ammonia, 



all of which crystallize very well. 



Action of j s i ia n h ere mention the action of various re- 

 reagents on 

 pemitrate agents upon pemitrate of uranium. 



of uranium. 



1. Prussiate of potash A dark red brown precipitate, 



somewhat similar to that of prussiate of copper. 



2. Gallic acid or infusion of galls O, if the salt contain 



an excess of nitric acid ; but if neutral, the precipi- 

 tate thrown down is very similar to that produced by 

 prussiate of potash. 



3. Carbonate of soda A light yellow precipitate, redis- 



solved by an excess of the carbonate ; again precipi- 

 tated on heating the liquid. 



4. Caustic soda A yellow precipitate, redissolved by an 



excess of the alkali. [Was this owing to the presence 

 of carbonate of soda ? Arfwedson says it is not re- 

 dissolved by the caustic alkalies.] 



5. Caustic ammonia A fine lemon yellow precipitate, not 



redissolved by an excess of alkali. 



6. Carbonate of ammonia A yellow precipitate, redissolved 



by an excess of the carbonate : solution, lemon yel- 

 low. 



7. Chromate of potash A fine orange precipitate of great 



intensity. 



8. Phosphate of soda A yellowish white precipitate. 



9. Arseniate of soda A white precipitate, with a slight 



yellow tinge. 



