Metallurgy. 119 
So 
ing table, showing the progress of the concentration of the silver in the 
lead in his experiments. 
Amount of silver in Silver in the Silver in the fluid 
the original lead. separated crystals. mother liquor. 
“704 pr. ct. ‘390 —-466 pr. ct. 1°025 pr. ct. 
"732 318 — "374 1:076 
966 *410 — 680 1°450 
"988 390 — 624 1°530 
1:442 "682 1-922 
2-090 . 2011 2°260 
2°116 1:728 —2°216 > 2°248 
2°206 : 2°268 
silver, the crystals separated with difficulty giving a mean amount of 
2264 pr, ct. of silver, while the remaining mother liquor contained 2-292 
Pr. ct. Two experiments made to determine the point of fusion of ar- 
Pentiferous lead, gave with a mercury thermometer the following results: 
ead with 0:0065 pr. ct. silver fused at 321° C. with 0-476 fused at 309° C. 
of bar-iron obtained from the puddling of pig-iron reduced from iron ores 
Mich in sulphur, or even from ores when reduced with n 
been devised for the desulphuration of this iron in the puddling process. 
thi ng the best of these is the addition of binoxyd of manganese; 5 
Ss liable to objection as it is infusible, and thus prevents its becoming 
roughly incorporated wi e iron; moreoygr, commercial oxyd of 
he enese often contains impurities which possibly m be taken w 
he iron in the puddling-process, and influence unfavorably the quality of — 
‘iron produced. This subject has recently been studied by Prof. - 
ful tt Richter of Leoben (Austria). Richter calls to mind the power- 
ly oxydizing effect of litharge (oxyd of lead), and its use to promote 
cation i _ experiment he 
the ton, thus affording a most simple means of correcting two sources of 
