124 PROCEEDINGS OF THE AMERICAN ACADEMY 



Partly for convenience of reference, and partly to show as distinctly 

 as jDOssible the extent and richness of the field of investigation now 

 opened, I have collected all the formulas of the last and present in- 

 stalments of my work, prefixing the mark f to those which are in my 

 judgment less certainly established. 



PHOSrHO-VANADATESo 



P0O5 . V2O5 . (NH4).0 + aq. 

 P,0. . V2O3 . 2 AgoO + 5 aq. 

 PA . 2 V2O, . (NH,),0 4- 7 aq. 



4 P2O- . 6 V2O5 . 3 K2O 4- 21 aq. 

 7 P2O5 . 6 V2O5 . 3 H2O 4- 34 aq. 

 20 V2O5 . P2O5 . 3 H2O + 56 aq. 



Arsenio-vanadates. 



5 AS2O5 . 8 V2O5 . 3 HoO + 24 aq. 

 t 7 AS0O5 . G V0O5 . 3 H.O. 



PhOSPHO-VANADICG-VANADATESo 



18 VoOj . VO2 . 2 P0O5 . 7 (NH,)20 + 50 aq. 

 t 4 V2O5 . VO2 . 5 P2O5 . 4 NaaO + 37 aq. 

 12 P2O5 . 12 VO2 . 6 V2O5 . 5 K2O + 40 aq. 

 12 P0O5 . 14 VOo . 6 V2O5 . 7 K,0 4- 52 aq. 

 14 P2O5 . 16 VOo . 6 V0O5 . 7 (NHJP -f 67 aq. 

 10 P2O5 . 11 VO2 . 5 V2O5 . 5 (NIIJoO -f 41 aq. 



Arsenio-vanadico-vanadates. 



12 AsoOs . 12 VO2 . 6 V2O5 . 5 (NIl4)oO + 7 aq. 

 9 AS2O5 . 9 VO2 . 8 V2O5 . 4 (NHJ2O -f- 11 aq. 



Vanadico-vanadates. 

 4 V2O5 . 2 VO2 . (NH,)20 + 8 aq. 



HTPOPHOSrnO-MOLYBDATES. 



8 M0O3 . 2 PO0H3 . 2 (NH4)oO -f- 2 H2O. 



Htpophospho-tungstates. 

 18 WO3 . 6 PO2H3 . 4 K2O + 7 aq. 



