I. RESEARCH. 499 



2431. Collection of Vanadium Compounds. 



Professor H. E. Roscoe, F.R.S. 



1. Vanadium ore, containing 2 per cent, vanadium. 



2. Roasted vanadium ore. 



3. Ammonium meta-vanadate (3rd crystallization). 



4. Pure vanadium pentoxide, V 2 O 5 . 



5. Vanadium tetroxide, V 2 O 4 . 



6. Vanadium trioxide, V 2 O 3 . 



7. Vanadium pentoxide, containing phosphorus. 



8. Vanadium mononitride, VN. 



9. Vanadium platinum alloy. 



10. Vanadium silicon alloy. 



11. Ammonium meta-vanadate (pure), NH 4 VO 3 . 



12. Lead meta-vanadate, Pb2VO 3 . 



13. Di-vanadyl monochloride, V 2 O 2 C1. 



14. Vanadium tetrachloride (VC1 4 ) decomposed into vana- 



dium trichloride (VC1 3 ) and Chlorine (Cl). 



15. Vanadous sulphate. 1 



16. Copper sulphate. J 



17. Potassium anhydro-chromate. "I 



18. Potassium anhydro-vanadate. / 



19. Sodium ortho-vanadate, Na 3 VO 4 +16H 2 O. 



20. Sodium ortho-vanadate (fused mass). 



21. Artificial vanadinite 3 (Pb 3 V 2 Og) + PbCl 2 . 



22. Fused mass of artificial vanadinite. 



23. Silver ortho-vanadate, Ag 3 VO 4 . 



24. Sodium pyro-vanadate, Na 4 V 2 O 7 + 18H 2 O. 



25. Sodium pyro-vanadate, crystallized from alcohol. 



26. Barium pyro-vanadate, Ba 2 V 2 O 7 . 



27. Basic pyro-vanadate of lead 2(Pb 2 V 2 O 7 ) + PbO. 



28. Silver pyro-vanadate, Ag 4 V 2 O 7 . 



29. Meta-vanadic acid, HVO 3 . 



30. Ammonium meta-vanadate NH 4 VO 3 (crystallized). 



31. Sodium anhydro-vanadate 2(NaVO 3 ) + V 2 O 5 (v. Hauer). 



32. Calcium di - vanadate, Ca2VO 3 + V 2 O 5 +18H 2 O (v. 



Hauer). 



33. Vanadium metal, V=51'3. 



34. Pure vanadium pentoxide. From VOC1 3 . 



35. Vanadium nitride, VIST. From metal and VC1 4 . 



36. Vanadium nitride, VN. From pure VC1 2 . 



37. Vanadium nitride, VN. From V 2 O 3 . 



38. Vanadium nitride, VN. From NH 4 V0 3 . 



39. Vanadyl dichloride, VOC1 2 . 



40. Vanadium sesquioxide, undergoing oxidation. 



41. Ammonium magnesium phosphate. From Berzelius's 



vanadium (1831). 



42. Thallium tetra- vanadate, T1 13 V 4 O 16 (or 4T1 3 VO 4 ). 



li 2 



