60 JOURNAL OF THE 



placed in cold water, and when the solution was cooled, 

 an excess of sodium thiosulphite was added. After the 

 solution became decolorized, it was boiled, and the 

 white precipitate (zirconium hydroxide according- to 

 Stromeyer) settled out well. This precipitate was easily 

 filtered, washed with hot water, burned and ignited 

 to constant weigfht. 



These results are reported : — 



iVjonbcrs. Found. Used. 



140 0.1315 0.1333 



141 0.0552 0.0565 

 143 0.1640 ) 

 145 0.1613 f 



0.1614 



Nos. 140 and 141 were in solutions in which there 

 was present free acid — No. 140 hydrochloric — and No. 

 141 sulphuric. No. 143 was not properly neutralized 

 and on addition of the sodium thiosulphite, a heavy floc- 

 culent flesh-colored precipitate settled out. This on 

 warming- became white, but when the precipitate was 

 burned showed the presence of some iron. No. 145 was 

 carried out exactl}^ according' to the directions given 

 above. 



IV. By Amnioiiium Sulphite. 



As I carried out the experiments, I failed to succeed 

 in perfecth^ separating iron and zirconium b}^ this 

 method, which is also recommended by Berthier.^^ So- 

 lutions of the chlorides of these two metals were made 

 with equal and varying amounts of each, then an excess 

 of freshly prepared ammonium sulphite was added. 

 The zirconium sulphite precipitated was soluble in an 



19. Booth's Encycl. Chem. 1850. 



