Mineralogy and Geology. 127 
The simple cup eolipile, fig. 2, gives perhaps 
a stronger heat than can be derived from a Ber- 
zelius lamp with a chimney, but will not serve © 
for fusing warning with soda, or for drawing out 
large glass 
An con, fig. 3., which unites all the de- 
sired excellences and which is but a slight modifi- 
cation of one previously in use in Germany, was _Fig- % 
introduced by the writer into the Giessen School 
ar. 
.ye 
Iti is clean, may be moved with as much facil- 
ity as the Berzelius lamp, gives a most intense 
heat for purposes of fusion, and may be employed 
with the ee convenience in all kinds of glass 
a clamp fastening it to the wick cylinder 
The fi following eae will od all needed 
danatio 
platinum and unscrews. The het -opening in 
the lamp is closed by a screw; c, cylinder for 
the support of a triangle and crucible ; _ eon 
chimney at the top of which glass may be dra 
cain August 4, 1847. 
Il. MineraLtocy AND GEOLOgyY. 
1. Report on Crystalline Slags peeinees ¢ in the Smelting and Manu- 
eeiure of Iron; by Joun Percy, M.D., and Witt1am Hatiows MILLER, 
essor of Mineralogy, Cambridge, (Rep. Brit. Assoc., for 1846.) 
~The following are the results of the analyses of Dr. Percy swith a state- 
ment of the crystalline form and other characters as given ‘ the memoir. 
crystals, allied to Idocrase.—The first series examined con- 
six specimens from hot-blast forheei in the vicinity of D 
hear Tipton; and one from a hot-blast furnace named La Providence, 
at Marchienne, Charleroi, Belgium 
-erysials were ones prisms or their secondaries, and were sim- 
ilar in form. H.=5:5—6. The —— all i i closely ; 
bts fous of them. 
a 
No. 1. | Ne 
38°05; 3 
14-11 1 
oh gs, "ero b ‘ 35:70 3 
» «nt ena ’ T6L | 
Protoxyd of manganese, 0-40; 0 
Broosyd ot ofiron,- | 127] 148 
a et, 185} 4-11 | 
‘Sul huret of | ‘cali, £ foe @en | 0981" 
: ‘a ae op » 0-19. 074 as 
| 100-00 | ab 
