51�Թ�

In a recent issue of the Chemiker Zeitung Dr. Kosmann has reported an analytical method for the examination of zinciferous products; according to this report, the ash and flue dust produced by the extraction of zinc from its ore comprise: Zinc dust, from the distillation of zinc,Flue dust, condensed in chambers of zinc furnaces with Kleemann's receivers,Zinc ash, of various assortments, from iron blast furnaces.

The various modifications of zinciferous flue ashes from blast furnaces are an object for continual demand, being both a valuable material for the production of zinc and, in its superior qualities, a desirable pigment.

A most complete and rapidly working method for the examination of zinciferous products has originated with the application of neutral ammonium carbonate as solvent.

When calcined zinciferous pyrites have to be examined, the estimation of zinc is similar to that employed in the analysis of zinc ore.

Zinc.—The zinciferous compounds—calamine, blende, and zinc ash—are all poor conductors.