ELISHA MITCHKLIv SCIENTIFIC SOCIETY. 53 



Found. Used. 



^rO-j 0.1785 0.1723 



V. By Ammo)iinm Carbonate. 



When a saturated solution of ammonium carbonate 

 ^vas added gradually to a zirconium chloride solution, 

 at first a white flocculent precipitate was thrown down. 

 This seemed to be produced by the free ammonia pres- 

 ent, but on a further addition the solution became clear 

 again. If this was boiled, a clear flocculent precipitate 

 came down. The boilmg- was continued for about fif- 

 teen minutes, when the carbon dioxide had ceased to 

 come off. The appearance of this precipitate was 

 exactly that produced by ammonium hydroxide, yet 

 the filtration was very slow, as in the case with the 

 other alkaline carbonate. In some hundred and more 

 precipitations by means of ammonium hydroxide, I have 

 never failed to secure the zirconium h^'droxide in such 

 a condition as to filter rapidh\ This was xQvy likely 

 a basic carbonate, which required continued heat with 

 the blow pipe for constant weight. Such a precipitate 

 when ignited g-ave 0.1733g. ZrO^ when 0.1723g. was 

 used. 



VL By Ammonium Oxalate. 



L. Svanberg,*^ because oxalic acid failed to gfive a 

 complete precipitation of zirconium, thought the solu- 

 tion contained a new element, which he called iiorlum. 

 Sjog^ren^'^ in his analyses of the mineral catapleiite said; 

 *' Kine nicht saure Losung der Erde aus dem Katapleiite 



9. Ofversigt of R, V. Akad. Forhandl. 1845, p. 37. 



10. Pog-g- Ann. 1852, Erg-anzung", III, p. 469. J. Prak. Ch. 55, 298. 



