66 URANIUM, ANTIMONY, CHROMIUM, c. 



tungstate of ammonia which crystallized in silky 

 plates. Its taste was much stronger, though si- 

 milar, and it was much more soluble in water. 

 I employed this last salt to determine the action 

 of reagents on its solution. I shall state the 

 results which I obtained, conceiving them cal- 

 culated to throw considerable light on the affini- 

 ties and compounds of tungstic acid. 



Action of i . Prussiate of potash No effect at first ; but after a little 

 reagents on . . . f ,, 



time a white precipitate tails. 



2. Gallic acid 1 



3. Tincture of galls I ~~* 



4. Sulphuric acid A white precipitate in flocks. 



5. Nitric acid Ditto. 



6. Muriatic acid Ditto ; soluble in an excess of acid. 



7. Phosphoric acid Q. 



8. Arsenic acid Q- 



9. Acetic acid Q- 



10. Oxalic acid Q- 



11. Tartaric acid Q. 



12. Chromic acid O- 



13. Muriate of barytes A white precipitate in flocks. 



1 4. Muriate of strontian Ditto. 



1 5. Muriate of lime 1 f A white precipitate, which 



1 6. Nitrate of lime J ( disappears on agitation. 



17. Muriate of magnesia O. 



18. Alum A white precipitate in powder. 



19. A fragment of tin with a drop of muriatic acid White 



flocks first separate, which gradually acquire a blue 

 tinge, and a deep blue colour surrounds the tin glo- 

 bule. 



20. Protosulphate of iron A yellowish white precipitate in 



powder. 



