36 F. A. Genth—American Vanadium Minerals. 
could not influence the analysis farther than very slightly with — 
reference to the amount of water which it contains. : 
The following are my results: 
a 6b c d e 
PhO = 41°36 50°17 42°89 27°12 42°38 
Cu0 = = 14:34 16°66 14°72 9°75 15°03 
¥,0, = ieee 19°05 15°87 9°96 15°77 
H.O:. =: T2 not determined ---- 7°25 
Si0, = 15:13 10°10 15°57 
Al,0, Pr 1°29 3°83 
Fe,0, = 2°72 7°60 2°19 48°84 4-00 
MgO | not det ings 
CaO t : 0°15 
The oxygen ratio of PbO: CuO: V,0,:H,O in the above 
analyses is in: 
a = 2°97 2°89 oat  - 660 
b = 3°60 3°36 8°34 ions 
c ro 3°08 2°97 dine ee 
d = 1°94 1°96 4°36 ;: ewe 
é = 3°04 3°03 6°00: 6°44 
or @ = 1 0°97 ig =. 210 
b = 1 0°93 2°31 noe 
c = 1 0°97 2°26 sese 
ad = 1 1°01 2°25 eras 
é = 1 1 Sad. tL 2 
The average of the five analyses gives the ratio of 
1 SOUS ya es 
9 ~ ee ae 
corresponding to— 
3 (3 PbO, V,0,) +(3 CuO, V,0,)+ 6 (CuO, H,O) +12 H,0. 
giving the following percentage: 
PbO 
= eis 
CuO = 18°95 
¥,0l = ‘1942 
H,O = 8°58 
100-00 
inite” from psittacinus, siskin- 
