1313 Johann Gottfried KIESSLING. Relatio practica de arte probatoria mineralium et metallorum, das ist: gründliche Erzehlung, wie alle und jede Mineralia auf gewisse Metalle... probieret und geschieden werden... Andere Auflage. 8° Leipzig: verlegts Michael Blochberger 1752 Ferguson Young [Illustration:- Frontispiece engraving. 157x86mm. This is a reprint from the engraved plate in the 1741 edition, however, the plate has been altered in three places. Firstly the man working in his laboratory is labelled "intelligo". The flames and smoke of the furnace has been extended to cover the fire-tools hanging on the wall. Also the man looking in at the window now holds a chain of the seven planetary metals, which hangs down the inside wall of the laboratory.]