54 JOURNAIv OF THE 



wird wohl von oxalsaurem Ammoniak gfef allt, aber dieser 

 Niederschlag" losst sich iiiclit nur in einem Uberschusse 

 des Falking-smittels, ^ondern atich in einem g-ering-en 

 Zusatz von Oxalsaure." Berlin/^ however, also said: 

 "" ^' " dass der durch dieser Salz (ammonium oxa- 

 late) in einer Ivosung- von Zirkonerde bewirkte Nieder- 

 schlag bei einem Ueberschusse des Fallung"smittels 

 wieder verscliwindet. " " " Atis dieser Auflosun^ 

 schlag"! Ammoniak die Zirkonerde vollstandig- nieder.'* 

 Hermann'' repeated all previous experiments, and not 

 only corroborated Berlin's observations, but determined 

 the best conditions for this precipitation. He noted 

 that in an excess of the precipitant (ammonium oxalate), 

 only four-tenths of all the zirconium was precipitated. 

 Such has been the result of my own experiments, save 

 the determination of the rate of precipitation as done 

 by Hermann. 



V/I. By Potassii{7)i Hydrog-oi Oxalate. 



Behrens(13) in his "Contributions to Micro-Chemi- 

 cal Analysis " notes that zirconium can be detected with 

 extreme delicacy (0.0005 m.g-r.) by that means. For 

 quantitative purposes, however, potassium hydrog-en 

 oxalate could not be used, as the precipitate formed was 

 soluble in an excess of the precipitant, but an incom- 

 plete precipitation took place on boiling-. 



VII. By Hydrogoi Peroxide. 



(See Separation Zirconium and Titanium.) 



IX. By Sulphur Dioxide. 

 Because of the analog-y of the elements, I was led to 



11.. J Prak. Ch. 58—145. 

 12. J. Prak. Ch. 96—332. 

 (13) Zeit. Anal. Chem. translated in Ch. News, XLIV— 124. 



