Mineralogical Notices. 233 
Norze.—We add here the following notice communicated for 
this Journal :— 
BE. Trescuemacuer.—The surface of the large masses of copper 
found in the celebrated Cliff mine, on the border of the lake, is 
H 
. - . 
lead. No metal having been found in the solution, it Is probable 
: that the yellow powder exists here as vanadic acid, VO°. 
The chocolate-colored earth from Isle Royale is quite a different 
mineral. After a few preliminary trials, the following process 
was adopted. The pulverized mineral was digested a short time 
me 
=, 
Qu 
ph 
“= 
or 
can) 
jm | 
=: 
ton) 
8. 
ou 
mh 
° 
3 
ma 
is 
7) 
~ 
a 
= 
co 
oat 
a") 
n 
ro) 
=% 
- 
eS 
‘S) 
3 
< 
is) 
7a) 
° 
= 
- 
=. 
2 
T was boiled in dilute hydrochloric acid, washed with a small 
quantity of hot water and dried. The result of this separa- 
tion of a considerable proportion of iron was a very light grey- 
eee eS tht te ee Sat 
al. 16, before 2:25 add #e, and for No. 21, 22, 23, before the analyses, read 22, 
%, 24.—p, 213, Hydromagnesite, anal. 1, for 0°27, read 0°57, and for 1°66 read 0-27. 
—P. 226, 21 and 271. from top, for Mn, read ¥n—p. 250, anal. 7, Pet 19°342, 
eu 
Pru; 
10010; 7th line from 
d 
anal. 3, for 315, read 4-15.—p. 362, anal. 3, for 51°50, 
f 
F.—p. 367, anal. 3, 
: read 5 
read 072, and for 100, read 100-46; anal. 6, for 100, read 
ead 9 366 fi 
ead 2-°0.—p. 679, Trito- 
dele 3 before R* Si— 
3D. D, 
30 
