66 jourJjal of the 



g^ass jetzt diese Losung" von oxalsaurer Ammoniak- 

 Zirkonerde in elne concentrirte Ivosungf von kohlensau- 

 rem Ammoniumoxyd." But I did not observe, " Dabei 

 blieb die Pliissig'keit gfanz klar und setzte auch nach 

 lang-erem Stehen keine Spur eines Niederschlag-s ab." 



A chloride solution of titanium, treated in the same 

 manner as above, g'ave a heavy precipitate, when the 

 double oxalate formed an addition of the ammonium 

 oxalate, was poured into a saturated solution of ammo- 

 nium carbonate. As noted above a precipitate was 

 obtained with the zirconium chloride solution as well; 

 nevertheless an analysis was made and 0.0327 g-. tita- 

 nium was found when 0.0302 g". had been used. This 

 proved to the writer that advantag-e could not be taken 

 of this for a complete separation of zirconium from 

 titanium. Hermann" noted this incompleteness in his 

 further remarks concerning* an experiment he performed: 

 "Die g'ering-e Differenz von 0.18 Theilen Zirkonerde zu 

 wenig- und 0.18 Theilen (used 6, found 6.18) Titansaure 

 zu viel kam daher, dass die Titansaure beim Fallen durch 

 kohlensaures Ammonium.oxyd ein g-eringfe Mengfe Zir- 

 konerde mit niederg*erissen hatte." 



I}^. By Hydrog-e)i Peroxide. 



So no g-ood and accurate method was known until 

 Bailey^** noted the effect of adding- hydrog-en dioxide to 

 a zirconium solution. This is the only thorougfhly accu- 

 rate method yet proposed. Its neatness and rapidity 

 in application are to be especially noted. At the same 

 time consideration must be g-iven to the difficulty in 

 obtaining- perfecth^ pure h3^drog-en dioxide. 



27. Ibid, 439. 



28. J. London Ch. Soc. Trans. 1886, p. 149. 



