Inidligence and Miscella^^q^^^^^^f^ ^ 



nood oak &,A /IVtanio acid ..,b<i>i» ♦Huod-Kso-loMiZ^v eJi feomil \i 

 aWsqea «i Ji iB,Eeroxide of iroiVn x^rfT- -.ft-Kw^oad^^ffio ^d faaniisJdo 

 na^Y^o ^o 9rnil'drQt(Meids,o^i,«^iSflf.a-(,M.oi.0iM(M saidioede lo 

 •i>iBw nfidJ 9iom aomi* 21 oi 01 YfinaupDanoo ,Wia{q§i)mJxj orfj rnoit 

 "^M»)i."dJ<«W?'^1ft?4»S^^i, *rk^b|849ionBJafnuoiiD arnBe adi labnu 



., .ia9D i9q S'9 oJ aJnaoraa 



-m 9TW fc3cJh0.9b O. - ^^^g ^^ SPHENEi'"'^ q^^ .79VODloM 



booaBvhfno 979W do • •. H.T ffipnd* no bolulhf', 



M. Rose reraarks, that, the difficulty which exists .in. separating 

 silica and titanic acid occasions the few analyses of sph^ne which 

 have been made to differ considerably from each other. 



Klaproth first analysed the sphene of Passau by fusing it with hy- 

 drate of potash ; the mass dissolved in water, supersaturated with 

 hydrochloric acid, left the silica as a residue, and the filtered solu- 

 tion was precipitated by solution of carbonate of potash; the pre- 

 cipitate after drying was digested in hydrochloric acid and left an 

 "iidditional residue of silica; ammonia poured into the filtered liquor 

 ■p'recipitated the titanic acid, and after its separation the lime was 

 "obtained by carbonate of potash. 



Klaproth afterwards analysed the sphene of Salzbourg by digest- 

 ing Avith heat in hydrochloric acid ; the insoluble residue was fused 

 with carbonate of potash, treated with water, and the solation was 

 saturated with hydrochloric acid ; the hydrochloric solutions were 

 mixed and precipitated by ammonia, and the filtered liquor was 

 freed from lime by carbonate of potash. The mixture of silica and 

 iatanic acid, precipitated by ammonia, was moderately driied' and 

 ^^reated with hydrochloric acid, which dissolving the titanic acid, left 

 ^(be silica undissolved. ^ io aijizo bns hioB 



^'' The results of these analyses were as follows t^svff^^^ n99<^ asd 



r , , f Silica ^ '?^^.^. •}% ''- ' 36 {rd^i9bia 



-oo i3lj.: Titanic acitf^^.,.^^"'.®/?...^.^-* §g anoiJisiaqcfgaid;! nl 



Lime ...'.'.'.'.'.'.'. '~}y^^^^ ;3ftiwonoig>d;t bgaiBJ 



•'" Magnesia ,...] trace 



80-1^ Water.-.' W.%^'. ...«...■•.-.. ^ -.»-... . biois iinrJiT 



fie-flg ie-8e ai-es ttt. noii ^o ^zoioi 



U\-P(i vo.oo ^o.rc. . . , . .^ .r mnHo o^AMo-r'f 



These results differ greatly from each 0$^,;-^ jljj^pjC^ Jf p^^ ,b? aljher- 

 wise, on account of the methods employed : the second, was i^etter 

 adapted than the first to give approximative results ; but yqt the 

 quantity of lime obtained was too small. munuozdo io abizO 

 Cordier found the sphene of Saint Gothard to consist oi,^}^ 



i),) r^G vSUica ..%,,. 28-0 



Titanic acid. 33-3 



Lime .TZ'?}^ ?i^X^}^^ K^[¥pS4 M^slluasr adT 



f i-'-p . . . bioi5 oin^^ 



t*B'8^ , , ,^ . . MQ-iilooliyyi '^ 

 He acted upp^^t by hydrochloric j^m^i^jwofj^t?,^ to dryness, col- 

 lected the silic?ion;^ filter, precipifcated tbe tatanicacid by ammonia. 



