On T Phosphoric Acid. 



B. P< l 24.93 26.70—26.22 

 ( ,,( » 1—65.74—64.85 



H< , 9.06— 8.56 - 8.93 

 7. Kupferdiaspor (Lynn), GuO 5, PO 5 BO, was first 

 analyzed by Lynn. 



L. P0 6 =24.22— 24.13 

 CuO=67.00— 69.61 

 BO= 8.78— 6.26 



II. P0 5 =23.1 1 

 CuO=66.86 

 BO=10.00 

 L802-18< _'. Vri^lite, Vauquelin (J. d. M. XL 2! 

 Vanquelin (1. c. | 



This mineral was discovered at Limoges by A.lluaud, from 

 whom Vauquelin obtained it; he fuses the substance for analysis 

 with caustic potassa, neutralizes the filtrate with nitric acid, 

 and precipitates the phosphoric acid with lime water. Ee 

 obtained 27 p. c. I >( >'. Berzelius, who analyzed it in L819 by 

 the Sulphide of Ammonium .Mnli.nl, found 32.8 p. c. PO 6 , 

 weighing it as Ca< » PO 5 . 



M. < i :.. PO i:i l. R i Ca | 2 &fg 3 Fe. 

 L803 1825. Dufrenite, Jordan (Min. Reisebemerk, 243). 



iquelin (Ann. Chem. Pharm. XXX. 202). 

 Vauquelin analyzed twenty-five years previously a similar 

 Bubstance. Be finds by loss 27.84 p. c. PO 6 , while in a direct 

 • let crm 'mat 'h.ii with PbO, Ac. he obtained 35.8 p. c, owing, no 

 doubt, to the formation of a compound of phosphate of lead 

 with Borne other lead Bait. 



l,d 2, PO 3 BO. 

 L805 1816. Wavellite^ Babbington (Davy's Mem. in Phil. 

 Trans. 16! 



:hw. .1. Will. 288 XXIV. L21). 

 mineral was discovered by Wnvd, and baa been 

 a analyzed; among others by Berzelius, Davy, Klaproth, 



