OP ARTS AND SCIENCES. 



273 



linking portion of the structural formula of the corresponding acid 

 may be written as follows: — 



HO - WO., 



I 



o 



W02-OH 



o 



vo„ 



vo,. 



2 (HO 

 2 (HO 

 2 (HO 

 2 (HO 

 2 (HO 

 2 (HO 

 2 (HO 



= VO - - OV = (0H)2 



I 

 = VO - O - OV = (0H)2 



I 

 = PO - O - OP = (OH), 



I 

 = PO - - OP = (OH), 



I I 



= PO - - OP = (OH), 



I I 



= PO - O - OP = (OH), 



1 I 



= PO - - OP = (OH), 



3 (HO) E PO - O - OP E (0H)3 



This formula, which, like most of those which I have given, is purely 

 conjectural, will at least serve to show how the two different states of 

 oxidation of vanadium may be represented in the combination, and 

 how the basicity of PO and VO may be affected by their position. 

 Such formulas are not without value, as suggesting the possibility of 

 forming new combinations, even if, as I prefer in this case to do, we 

 consider the salt represented as double or triple. Structural formulas 

 for double and still more for triple inorganic salts would probably be 

 still more complex, and what I have aimed at is to show how all the 

 valences may be satisfied in an arbitrarily selected compound contain- 

 ing four oxides of three different types. 



The general results deducible from the formulas which I have given 

 in the present instalment of my work are as follows : — 



1. Hypophospliorous and phosphorous acids may enter into combi- 

 nation with tungstic and molybdic oxides as links, so as to form com- 

 plex inorganic acids. The structure of these four classes of acids 

 indicates the possibility of forming new series of acids, in which 

 methyl and other organic radicals or residues may take the place of 

 the constitutional hydrogen of the hypophospliorous and phosphorous 

 VOL. xviii. Is. s. X.) 18 



