670 report — 1884. 



12WO, . 2{II . PO . (OH),} 2(NH 4 ) 2 + 8 aq. and 12Mo0 3 . 2{H . PO . (OH),} 



2K 2 + 12 aq. 



The author found that various organic radicals so-called, as for instance the 

 methyl, ellyt, phenyl, &c, derivatives of hypophosphorous and phosphorous acids, 

 -appeared to form similar complex acid3, so that an immense field for further 

 research is at once opened. 



He in the next place studied the relations of tungstic and molybdic oxides to 

 the various isomeric modifications of phosphoric acid. Pyro-phospho-tungstates 

 and pyro-phospho-molybdates may perhaps exist, but the author could not at 

 present speak positively upon this point, as the phosphoric oxide passed with great 

 rapidity into the ortho-phosphoric acid. With respect to the various rneta- 

 pb.ospb.oric acids, the case is different. These enter freely into comhination with 

 tungstic and molybdic oxide to form new acids. Thus the formulae of a hexa- 

 meta-phospho tungstate analysed in 8W0 3 . 6 P0 3 K . 2K,0 + 21 aq., and of an 

 analogous molybdenum compound 14MoO . GP0 3 Ba 3 . BaO + 55 aq. The author 

 considers the existence of salts containing ethylo-phosphoric acid, and its congeners 

 as at least probable. Compounds also occur in which part of the oxygen of 

 phosphoric or arsenic pentoxide is replaced by sulphur or fluorine. 



In place of pentoxides, the teroxides of the same elements may combine with 

 tungstic or molybdic oxide. Thus we have various series of arsenoso-tungstates 

 and molybdates,"and corresponding compounds containing antimonious and vana- 

 dious oxides. Sb,0 3 and V.,0 3 . These pass by oxidation into the salts contain- 

 ing the pentoxide3. The general formula is : 



m U Ui 3 . n W%O a . p R',.0- 



Double compounds of this series also exist, the general formula being : 



m R vi 3 . n R iH 2 3 . n R'" s O a . p R' 3 0. 



Mixed types containing both pentoxides and teroxides also occur, the general 

 formula being : 



m R Ti 3 . n R m ,0 3 . R T 2 5 • P Ri j° 



in which R m and R Tl may be different. 



The formulae of two compounds containing R„0 3 are respectively 18AV0 3 . 

 2As,0 3 . 8BaO + 42 aq., and 8Mo0 3 . 2As 2 3 . 3BaO + 13 aq. Into these and 

 similar compounds platinous chloride, PtOL, may enter to form new series in 

 which the complex ILO, . 2Pt01 2 replaces R,0 .. 



In place of platinous chloride, other metals of the same group may enter, while 

 on the other hand, the chlorine may be replaced bv bromine, iodine, or the com- 

 plexes S0 3 K . Se0 3 K and Te0 3 K. 



The author found that the type of the silico-tungstates discovered by Marignac 

 ■was also susceptible of generalisation ; SiO„ being replaceable by a large number 

 of similar oxides, as for example by the oxides of selenium, tellurium, platinum, 

 &c. Mixed types containing B^O., and R Tl 2 5 also exist as well as types con- 

 taining R m 2 3 and R ir O„. As illustrations of the former, the author gave the 

 formulae : 



28Mo0 3 . 4V„0 5 . V0 2 . 11(NH 4 ),0 + 20 aq., and 12W0 3 . 2V„0 5 . 3V0 2 . 



6Na 2 0" + 43 aq., 



and as a further illustration of the fertility of this field of investigation the 

 formulas : 



60WO 3 . 3P 2 5 . 2V 2 5 . TO„ . 18BaO + 144 aq., and 60WO 3 . 3P 2 5 . V 2 0, • 



VO„ . 18BaO + 150 aq., 



the former having the molecular weight 20,058, and the latter the molecular 

 weight 20,066. 



In conclusion the author stated, that in formulating certain compounds con- 

 taining V 2 5 , he had found that much simpler expressions resulted when a part 

 of the V o 5 °was supposed to have the structure (V 2 2 )0 3 , V 2 2 replacing W or 

 Mo. To" support this view, he brought forward several new series of complex 



