Mineralogy and Geology. . 423 
Alloy of Bismuth 82 parts, ............ 3 
‘Anti 0°884 24:0 
ntimony 1 part,........ +o ie oe Cue 
7 of Bismuth 12 parts, ......... + Lo519 29-0 
Me OTS iii aa ieee oe 4s OE 
Alloy of Antimony 2 parts, Zinc 1 part, .. 0413 25°0 
NG Bc A jitacnaccsesvevcey ven e 0:0693 22°0 
GING Foie... cers os POLad 0°0436 22:0 
eee 5s dia PENS 0:0386 25°0 
MMS Guin s «hye on 68 Cooke ett 0:00395 22:0 
Bunsen’s Battery-coke, .........2.0.00: 000246 26'2 
TES as eer Caen ren, aaeeerree re 0°000777 19°6 
EE MOMPHOTUB, 6505s be ise ve nv bes 0:00000123 240 
All the metals were the same as those used for my thermo-electric ex- 
periments, with the exception of cadmium, which was purified by my 
friend Mr. B. Jegel. 
The alloys of bismuth-antimony, bismuth-tin, antimony and zinc were 
determined in order to ascertain, whether, as they give, with other metals, 
such strong thermo-electric currents, they might be more advantageously 
employed for thermo-electric batteries than those constructed of bismuth 
timony. 
ppers No. 1, 2, 3 were wires of commerce. No. 1 contained small 
quantities of lead, tin, zinc, and nickel. The low conducting power of 
0. 1 is owing, as Prof. Bunsen thinks, to a small quantity of suboxyd 
SA? 
0.2 a mixture of both. The specimens were purified by Brodie’s 
odium, zine, magnesium, calcium, cadmium, po ium, tin, lead, stro 
om antimony, bismuth, tellurium, and the alloys of bismuth-antimony 
and bismuth-tin. The way in which these wires were made ribed 
y oo ; ‘ 
| The great domi t fact in the titanic irons is their isomorphism with 
hematite, Fe203, and if. wo, adopt Laurent’s view of the constitution of 
| compounds, instead of looking for a titanate and sesquioxyd com- 
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