The Cheinistiy "f F'-'-sil Iw.in- \'2U 



chloric acid. aiRl after liaviiij; Ihm'Ii puriticd from iiujislurt* In- siilpliuric 

 acid and from hydrochloric ai-id Uy copper sulphate, wa-s ab.sorl)<*<l in n 

 weighed .soda-liuu' t\ilje. 



Silica \va.s separated, and estimati-d in Uii- usual manner \>\ i\n[)ora- 

 tion to drynes.s with hydrochloric acid. 



Trinianganic Tetroxide. Ferric chloride wa.s added to tin* filtrate 

 from the silica: and the phosphate, ahunina. and exceHS of iron were 

 removed by the ba.sir acetate method. Manganese was estimated in the 

 filtrate as trimanganic tetroxide, after precipitation with Ummine and 

 annnonia and ignition. 



Calcium Oxide. — ^The tiltrate from the maniranest* hydrate was boiled 

 and the calcivnn pr<>ci])itated by aninioniuin oxalate and wi'ighed as 

 calcium oxide. 



Mai^nosia. — The annnonium .salts were reUKjved from the filtrate from 

 the calcium oxalate bv evai)oration to dryness with nitric acid. The 

 residue was dissolved in a few cubic centimetres of hydrochloric acid, the 

 liquid made slightly alkaline with ammonia, and filtered. .Magnesia was 

 estimated in the tiltrate as pyrophosphate i?) the usual manner. 



Phosphorus Pentoxide. — Half a gram of ash was taken, and after 

 the removal of silica the phcjsphoi-ic acid was precipitated by ammonium 

 molybdate in nitric acid solution. The ammonium ph(jspho-molybdate 

 was dissolved in ammonia and the phosphorus precipitated by magnesia 

 mixture, ignited, and weighed as pyrophosphate. 



Ferric Oxide and Alumina. — The .silica was removed from 2 grm. 

 of the a.sh. The filtrate was nearly neutralised by ammonia, and tlie 

 phosphates of iron, aluminium, and .some calcium were precipitated by 

 ammonium acetate, ignited, and weighed (FcgO.,, AlgOg, CaO, P2^r,)- ^''^ 

 resulting material Avas dissolved in hydrcjchloric acid, neutralised, and the 

 calcium removed by precipitation as oxalate in a solution made freely acid 

 with citric acid. This ))recipitate was ignited and weighed as oxide. The 

 filtrate from it was made slightly alkaline with annnonia, and the phos- 

 phorus precipitated by magnesia mixture. This gave the phosphorus 

 pentoxide. The iron was precipitated by passing sulphuretted hydrogen 

 gas through the solution. This precipitate was dissolved by hydrochloric 

 acid, oxidised with nitric acid, and precipitated as ferric oxide with 

 ammonia. This was filtered off', ignited, and weighed. Alumina wa« 

 estimated bv difference. 



[Tablk. 



