670 



iiErouT — 1884. 



-.1 ;.. ;., 



12\V03 . 2[!I . PO . (OH),] 2(XFr,y,0 + 8 aq. (ind 12MoO, . 2 [11 . PO . (OTI) ] 



2Kp + l2aq. ' -* 



The author found tlitU various orgauic radicals so-called, as for instance tlm 

 metiiyl, idlyt, plioiiyl, iVe., dm'ivatives of livpopliospli'trous and phosphnrous acids 

 iippcaivil to form .siniilar cjinplox acida, so that an imniunsis lield for fiirtlier 

 roseiircli is at once opeued. 



IJc in the noxt place stiidietl the relations of tunffstic and molylidic oxide.s te 

 the \arions isomeric mndilications of pliosphoric acid. Pyro-])hi.ispli(i-tuii:.>-.stat;>s 

 and pyro-pliiispho-m(ilylid:Ues may perliaps exist, hut the author could not iit 

 present speak ]);)sitively Ujjon tliis point, asthe phosphoric oxido passed with jrroiu 

 rapidity into the ortlio-pliosphoric acid. With rt'spect to the various nieta- 

 phosphoric acids, tlie case is dill'erent. These enter i'recly iuto conihiniiti'ni mIiI; 

 tun;irstic and moh hdic oxide tt) I'nrni new acids. Tlius tlio formuhc of a Lexii- 

 :neta-pliospho tunL-'stati* analysed in ''~*W()., . (i PO.dv . 2Iv,0 + 21 aq., and dl' an 

 analogous niolyhdenum compound Jd.MoO . (iPO.lJa, . .I>a0 + 55 aq. Tiie author 

 considers the existence of silts containing otliylo-pliosphmdc acid, and its congeners 

 as at least probable, ('om|)Oiuids also occiu" in winch part of tlio oxyiren ni' 

 phos])hi)ri(! or arsenic jientoxide is re]ilaced by sidphur or lliioriiie. 



In ])lace of penioxides, the teroxi<le.s of the same cloments may combine witli 

 tungslic or molybdic oxide. Tiuis we have various series of arsenoso-tunpstatis 

 and molybdates, and correspondinjr compounds containing antimonious and vana- 

 dions oxid(>s. Sb.jO., and Y./).; . These ]iass by oxidation into the salts contain- 

 ing' tlie pentoxides. Tlie g-enera,l formula is : 



}n 



W'O,. n 1V''JI. 



IV. .{\ 



Double compounds of this series also exist, the ^cu'Td formuh: I 



)enm' 



li^'O,,. « ll'^A . n \V",<),, . i> K',(). 



?dixcd types containin;^- both pentoxides and teroxides also occur, the general 

 formida being: 



In v.-liich 11'" and ]^' 



nuiv 



be dill'erent. 



Tlie fornudfe of two (■■jnipounds containing 11. ,0,, are respectively ISWOj , 

 2As,,0:,. 8J?aO + 42 aq., and S.M.jO., . 2As,0,/. ;i]";a() + 1^ arj. Into these am! 

 similar compounds platinnus chloride, I'tCl.,, may enter to form new series in 

 Avhich the complex 1!,(»,, . 2Pt('U replaces 1 1 ,(),.' 



In place of jdatinous chdoride, t)ther metals of tlie same jiToup may enter, wliiL' 

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

 plexes SO,, K . SeO.,K and Te(),,K." 



The autbn- found tluit the typo of the silico-tungstates discovered by ^farignac 

 "was also susceptible of gencralis;ition; SKI, being replaceable by a large nuuibiT 

 of similar oxides, as i'or examjde by the oxiiL's of .selenium, tellurium, platinun;, 

 (.^■c. Mixed types containing IJ'^'O., and l^'.jO. also exist as well as tyjies con- 

 taining U'" 

 formnl.'e : 



2SMo(> 



1)., and ri''(_)j. As illustrations of the former, the author gave th'> 



ind 12 WO, .2V,0, .TA'D.. 

 this field of invest iL'ation the 



IVoO, . VO, . 11(NII,),0 + 20 aq 

 GNa.jO + 4o aq., 



and as a further illustration of the fertility o 

 formuhc ; 



GOWO3 . nP„0, . 2V„(X . YO.. . ISP.aO + 111 aq., and OOWO,, . SPPs . Y,.0,. 



YO, . ls|!a() + ]o() aq., 



tl:e former Laving the mcdecular welirht 20,058, and the latter the molecular 

 weight 2O,0G6. 



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

 taining YoOr, , he had found tluit nmcli simpler expn^sslons resulted when apart 

 cf the Y.,Oj, was supposed to havi^ the structure (VoO.^O^ , YJ)o replacing W or 

 Mo. To support this view, hc' brought forward ceveral new series of complex 



