192 On Trtbasic Phosphoric Acid. 



of molybdic acid Bolntion, which, after heating, produced only a 

 Blight yellow coloration, without any precipitate whatever. 



This, therefore, is, besides the molybdic acid method, the only 

 one by which phosphoric acid can be separated from iron in 

 such a way thai no appreciable amount will remain with the 

 latter. For better comparison, I give the' averages of all the 

 analyses again. 



Normal composition, 



PO, 36.86 

 IV 0, 33.23 

 110 29.91 



(1) PO, 36.7<> Determination of iron 

 Fe, 0, 33.27 (by permanganate) 



IK) 29.97 and water. 



PO, 36.74 M0 3 Method. 

 Fe, <> ; , 33.46 

 IK) !>!»<> 



(3) PO 36.64 SiO a « (Berzelius.) 



Fe, O, 33,17 

 ]K) 29.89 



i PO, 86.40 BiO " (Fuchs'J 

 Fe, <> : 33.83 

 HO 29.77 



(5) PO, 35.95 MI,s v . " 

 Fe, 0, 33.04 

 IK) 81.0] 



PO 85.90 EJg. 

 Fe 0, 84.47 

 IK) 29.68 



